Research libraryInventory as a Decision
Chapter 04 of 14 · Part II · Draft web edition
The relevant lead time ends when approved material is usable, not when a supplier announces that it has shipped.
The cloth is woven from this chapter's 5 exhibits: each weft is one exhibit's own data, normalised; each warp group is a section. The probe reads the exhibit's own value where it crosses. Procedural visualisation, not a measurement.
Read-out
Illustrative ten-stage order-to-release timeline totaling 48 calendar days on an assumed import replenishment order. No local Cameroon duration is claimed; interval structure adapts WCO Time Release Study boundary mapping (S30) and supply-chain event reconciliation (S12, S13, S31).
Unit: illustrative calendar days. Status: illustrative. Sources: S12, S13, S30, S31. Illustrative figures are teaching examples, not measured factory results.
A garment factory cannot sew a shipping notice, a bill of lading or a customs pre-declaration.[S07] The replenishment clock that governs inventory policy starts when an internal requirement is raised for approval and stops only when an inspected, shade-verified and unencumbered lot is released to usable stock at the cutting table or trim store.[S30] Treating a vendor's quoted manufacturing window or ocean transit time as the complete lead time omits the administrative, port, border, inland and quality-release intervals where delays concentrate.[S12] Worse, reducing those intervals to a single arithmetic average conceals the upper tail of the distribution, the unfinished open orders still waiting in transit, and the tendency for delays to lengthen when seasonal demand or supplier utilisation peaks.[S22] Green Future Tech Limited (GFT), Hong Kong SAR, therefore requires any apparel operation under its Cameroon textile programme design to map and timestamp the ten-stage order-to-release clock, retain right-censored and split shipments in the empirical record, and evaluate whether compressing procedural variance is cheaper than financing a larger safety buffer.[S30]
This chapter establishes the measurement contract linking physical logistics and customs release to the safety-stock and lot-sizing rules developed later in this paper.[S05] While national industrialisation ambitions frame the context, where source-annex records indicate that about 95 percent of Cameroon's cotton fibre is exported raw against about 5 percent processed locally and policy targets reach 50 percent local processing by 2030, a planner cannot derive a trim or fabric buffer from macro targets.[R06] [R07] Each material route, whether importing dyed shirting and zippers through a coastal port or moving yarn and greige cloth along a domestic corridor from northern ginning centres, carries its own staged time distribution, contractual risk allocation and data-capture requirements.[S14] [S29] The discussion below is an operational and statistical engineering method, not investment, legal, customs-brokerage or tax advice.[S29]
4.1
A replenishment policy protects the interval between recognising a material need and placing usable stock into production.[S05] If the measured lead time is truncated at the supplier's factory gate or at vessel arrival, the unmeasured downstream days do not vanish; they consume the safety buffer before the material ever reaches an operator.[S12] In apparel manufacturing, where a missing care label, sewing thread cone or approved metal zip can halt an entire cutting lay, the replenishment boundary must coincide with the physical and documentary conditions required for line release.[S07] [S31]
T0 to T1): The interval from the planner's validated net-requirement signal to authorised commercial and cash commitment.[S07] When working capital is tight, requisitions can sit in an internal approval or deposit queue for several illustrative days before the supplier receives a binding order.[S18]T2 to T3): Physical conversion, dyeing, finishing or trim assembly at the vendor's facility, including any subcontracted stages mapped for due-diligence visibility.[S25]T4 to T5): Main-carriage maritime, air or overland transit to the port of entry or land frontier, tracked by carrier event logs.[S12]GFT note
Never overwrite the original supplier promise date when a vendor sends a delay notice. Overwriting the baseline promise makes a late supplier appear 100 percent punctual against its final revised schedule, destroying the lead-time-variance history needed to size safety buffers.[S05] [S30] Store the original promise, every revision timestamp and the realised usable-receipt date as immutable records.[S31]
The structure of this ten-stage clock is shown in Exhibit 14, illustrating how a shipment that looks rapid on a vendor's production tracker can take nearly twice as long to reach the cutting table.[S30]
As Exhibit 14 illustrates on a constructed 48-day teaching timeline, vendor manufacturing and consolidation (T2 to T4, days 9 to 25) plus main carriage (T4 to T5, days 25 to 35) account for 26 calendar days out of 48 illustrative days.[S12] The remaining 22 illustrative days occur before vendor production begins (9 days of internal approval and deposit clearance) and after port arrival (13 days across discharge, customs release, inland haulage, receiving and quality inspection).[S30] While Exhibit 14 cannot establish actual transit or dwell durations for any specific Cameroon shipment, it shows why calibrating a reorder point from a 16-day production quote plus a 10-day maritime quote leaves 22 illustrative days of demand unprotected.[S05]
As Exhibit 14 illustrates on a constructed 48-day teaching timeline
S12 · illustrative
A frequent unit error in inventory spreadsheets is multiplying a lead time measured in calendar days by a daily consumption rate calculated over factory working days.[S05] Vessels steam seven days a week and port storage runs across weekends, whereas a garment factory in Cameroon operates a standard 40-hour week across five or six working days (up to the 48-hour maximum in the shared evidence register).[R16] [S12] If a line consumes an illustrative 600 metres of pocketing fabric per working day across a six-day week (3,600 metres per seven-day calendar week, or 514.3 metres per calendar day) and the replenishment clock spans an illustrative 35 calendar days (30 working days), expected demand over the lead time is 18,000 metres.[S05] Multiplying 600 metres per working day by 35 calendar days overstates expected demand at 21,000 metres, inflating the trigger by an illustrative 3,000 metres.[S05]
T_phys): The actual time when the physical or regulatory transition occurred, recorded separately from the system-posted date (T_post) when a clerk or offline scanner uploaded the entry.[S27] [S31]Separating T_phys from T_post prevents administrative batching from corrupting lead-time variance.[S31] If interlining is released from quarantine on Friday afternoon (T10_phys) but posted on Monday morning (T10_post) after a connectivity outage, using T10_post adds three spurious days to the sample.[S31] Conversely, posting a goods receipt from a packing list while the truck is still queuing outside the gate understates the clock and creates phantom usable stock.[S15] [S27]
4.5
Exhibit 157 paragraphs step it
Read-out
| S14 | World Bank (2015-02-12) | Port of Douala efficiency diagnosis | Justifies separating arrival, discharge and release stages | Historical 2015 study; never use as a current parameter |
|---|---|---|---|---|
| S13 / S0401 | WTO (2017-02-22 / n.d.) | Trade Facilitation Agreement Article 7 | Defines pre-arrival processing and guarantee release levers | Legal treaty text; does not prove local clearance speed |
| S12 | World Bank (2025) | LPI shipment-level operational tracking | Establishes weakest-link corridor timestamp tracking | Macro indicators; no SKU-level Cameroon distribution |
| S30 | WCO (2025) | Time Release Study Guide Version 4 | Provides protocol for interval sampling and outlier audit | Methodology only; requires local execution on shipments |
Comparison of opened institutional sources on trade facilitation, port efficiency and release-time measurement. None of these sources supplies a current factory-specific lead-time distribution for Cameroon apparel inputs.
Unit: source scope. Status: sourced. Sources: S12, S13, S14, S30, S0401.
When designing a supply chain in Cameroon, analysts are sometimes tempted to lift port dwell times from older macro-economic reports and plug them into an inventory formula.[S14] GFT's evidence rules forbid this shortcut: historical port diagnostics and international indices explain why border and corridor stages must be measured separately, but they cannot supply current numeric parameters for a live buffer.[S12] [S14]
In February 2015, the World Bank examined the efficiency of the Port of Douala and noted that vessel turnaround and dwell constraints were tied to channel and terminal conditions: "This was mainly due to a lack of investment and the absence of routine dredging."[S14] For a supply-chain architect, that 2015 diagnosis teaches a structural lesson: maritime arrival (T5), berth discharge and declaration (T6), and customs and terminal release (T7) are separate operational bottlenecks that can dominate the replenishment clock if left unmeasured.[S14] [S30]
Citing a 2015 report as if it described container release times in 2026 would, however, be invalid.[S14] Over the intervening decade, Cameroon's maritime and corridor infrastructure has changed through the commissioning of the deep-water Port of Kribi, updated terminal concessions and revised customs procedures.[S12] [S14] Neither the 2015 Douala study nor macro cotton-sector reports on Camtext SA or SODECOTON provide a verified 2026 distribution of container release times for apparel inputs at Douala or Kribi.[R03] [R09] [S14]
A parallel caution applies to global logistics benchmarks.[S12] In its Logistics Performance Indicators: LPI Report 2025, the World Bank highlights stage interdependence: "Supply chains are only as good as their weakest link."[S12] The revised LPI methodology combines survey data with shipment-level tracking datasets covering containers, air freight and parcels, measuring corridor turnaround from operational timestamps rather than perceptions alone.[S12]
Meanwhile, the World Trade Organization's Trade Facilitation Agreement (TFA), which entered into force on 22 February 2017, states that "The TFA contains provisions for expediting the movement, release and clearance of goods, including goods in transit."[S13] [S0401] Article 7.6 of the TFA encourages members to measure release times using the World Customs Organization (WCO) Time Release Study (TRS) method.[S30] [S0401] Version 4 of the WCO Time Release Study Guide (2025) refines process mapping, interval segmentation and outlier analysis across border agencies, noting that "Improvements have been made to questionnaire design and sampling techniques to ensure data accuracy."[S30]
The distinction between what these institutional sources establish and what a factory planner must measure locally is summarised in Exhibit 15.[S12] [S14] [S30]
As Exhibit 15 shows, institutional reports provide diagnostic structure and audit methods while leaving local durations to be measured.[S12] [S30] Before a Cameroon garment operation compares sourcing through Douala, Kribi or northern corridors from Garoua, GFT's evidence gate requires dated carrier and clearing quotes, mapped regulatory approvals for the relevant tariff headings, and timestamped shipment samples.[R03] [R10] [S14] [S29] [S30] Because shared annex references R19 to R22 are missing from the register, this chapter makes no claim regarding regional tariff bands or trade-preference dates.[S13]
4.8
Imported pocketing fabric
Imported pocketing fabric: Naive completed-only 80th pct 30, Censoring-aware 80th pct bound 42. Difference +12 (illustrative calendar days) · derived
Even when a factory records accurate timestamps from T0 to T10 …
Custom dyed metal zips
Custom dyed metal zips: Naive completed-only 80th pct 24, Censoring-aware 80th pct bound 35. Difference +11 (illustrative calendar days) · derived
Domestic greige cotton cloth
Domestic greige cotton cloth: Naive completed-only 80th pct 11, Censoring-aware 80th pct bound 17. Difference +6 (illustrative calendar days) · derived
Imported care & brand labels
Imported care & brand labels: Naive completed-only 80th pct 16, Censoring-aware 80th pct bound 23. Difference +7 (illustrative calendar days) · derived
The method behind it: Method.
Derived from constructed 10-order illustrative cohorts using the Kaplan-Meier product-limit method (S0402) and supply-censoring principles (S22, S30). Row 1 reflects the worked example in the text (30 days naive vs 42 days censored lower bound).
Unit: illustrative calendar days. Status: derived. Sources: S22, S30, S0402.
4.8 · the bodyExhibit 16 above; its figures are illustrative where marked.
At any review cutoff date, recent orders that moved quickly have already passed T10 and appear in the completed receipts table.[S30] Orders placed weeks earlier that are stuck at a transshipment port, held in a customs query at T6, or waiting in quarantine at T9 for shade resolution have not yet reached T10.[S22] [S30] As Chen, Jiang, Zhang and Zhou (2023) note, "A key challenge in this learning problem is that both demand and supply data can be censored; hence only truncated values are observable."[S22] Filtering for completed orders drops every in-flight delay from the calculation.[S22]
To eliminate survivorship bias without inventing arrival dates for open cargoes, GFT uses the non-parametric Kaplan-Meier (product-limit) estimator documented by the National Institute of Standards and Technology (NIST): "No underlying model (such as Weibull or lognormal) is assumed; K-M estimation is an empirical (non-parametric) procedure."[S0402] An order still open at the cutoff date with elapsed duration c_j is recorded as right-censored at c_j: its eventual usable lead time exceeds c_j, so it remains in the risk set n_i for all observed completion times t_i up to c_j.[S0402]
Supply censoring also occurs when an order arrives in split shipments or when quality control releases 70 percent of a fabric lot at T10 while holding 30 percent in quarantine.[S22] [S31] Stamping the order with the first partial receipt date misleads the planner when an illustrative 10,000-shirt uniform order needs all 15,000 metres of fabric before the full contract can be fulfilled.[S07] GFT tracks three distinct metrics on split orders: first-usable-lot lead time (for progressive daily cutting), quantity-weighted lead time (for supplier flow monitoring), and order-complete (kit-complete) lead time (elapsed days until 100 percent of the ordered usable quantity and dependent trims pass T10).[S07] [S30] [S31]
The gap between naive completed-only reporting and censoring-aware bounds across four illustrative material categories is shown in Exhibit 16.[S22] [S0402]
As Exhibit 16 demonstrates across the four constructed cohorts, ignoring open orders and partial deliveries compresses the apparent 80th-percentile lead time by 6 to 12 illustrative calendar days.[S22] [S0402] While the day counts are illustrative, the mechanism holds universally whenever open orders are older than the completed median.[S0402]
…partial deliveries compresses the apparent 80th-percentile lead time by 6 to 12 illustrative calendar…
S22, S0402, S0402 · illustrative
Interlude · the cloth half-woven
Woven: sections 4.0 to 4.8Still to weave: 4.11 to 4.17
4.11
When 80 percent of shipments clear through a documentary channel in 2 to 4 illustrative days while 20 percent undergo physical scanning or valuation review taking 14 to 22 illustrative days, the distribution is bimodal.[S30] A single Gaussian mean and standard deviation over-buffers routine shipments while under-protecting against inspection holds.[S05] [S30] Consistent with the WCO Time Release Study Guide Version 4, GFT requires lead-time summaries to report six mandatory metrics: total and completed sample counts (N_total, N_complete), observation window dates, median (P50), interquartile range (P75 - P25) alongside standard deviation (sigma_L), upper quantiles (P80, P90, P95) or censored bounds, and the maximum observed and oldest open duration.[S05] [S30] [S0402]
The spread between routine medians and 90th-percentile tails across five illustrative lanes is shown in Exhibit 17.[S05] [S24] [S30]
…spread between routine medians and 90th-percentile tails across five illustrative lanes is shown in…
S05, S24, S30 · illustrative
Read-out
Illustrative lead-time intervals across five constructed sourcing lanes. Low = 20th percentile (fast routine receipt); Mid = 50th percentile median; High = 90th percentile delayed tail where physical inspection, transshipment rollovers or shade re-tests occur. Basis: S05, S24, S30.
Unit: illustrative calendar days. Status: illustrative. Sources: S05, S24, S30. Illustrative figures are teaching examples, not measured factory results.
In Exhibit 17, every illustrative lane shows strong right skew: the distance from the median (mid) to the 90th percentile (high) is roughly three times the distance from the 20th percentile (low) to the median.[S24] [S30] For the illustrative Asian sea-freight lane, the median is 42 days (20th percentile 34 days), but the 90th percentile reaches 68 days, a 26-day tail extension.[S12] [S30] While Exhibit 17 is an illustrative model rather than measured Cameroon factory data, it shows why buffering only for a 42-day median leaves the line vulnerable whenever a shipment falls into the upper decile.[S05]
the median is 42 days (20th percentile 34 days)
S24, S30, S12, S30, S05 · illustrative
Claiming an empirical 95th percentile from a small sample is mathematically unsound: with N = 12 monthly orders per year, the sample maximum has an expected cumulative probability of 12 / 13 (about 92.3 percent), and the chance of observing zero draws from the worst 5 percent tail is (0.95)^12 (about 54.0 percent).[S05] GFT therefore enforces three sample-size tiers: below 10 observations, planners must use structured three-point scenario bounds and manual review; from 10 to 29 observations, planners combine the empirical Kaplan-Meier 80th percentile with a scenario tail buffer; and at 30 or more observations, empirical quantiles up to the 90th percentile may be used if stationarity holds.[S05] [S30] [S0402]
Similarly, planners must not delete inconvenient delays (such as an illustrative 75-day port breakdown or storm hold) from the database.[S30] Following WCO outlier guidance, every valid timestamp remains in the master ledger: an extreme point may be excluded from the routine reorder-point layer only through an auditable exception record signed by planning and finance (never for internal payment delays), and every excluded point is automatically transferred into the disruption stress register for Chapter 5 and Chapter 13 scenario testing.[S23] [S27] [S30]
4.14
Standard safety-stock formulas assume that lead time L is independent of daily demand D_t and independent across consecutive orders.[S05] [S24] As Michna, Nielsen and Nielsen (2015) note, "The assumption that the lead time is constant is rather unrealistic."[S24] Assuming that random lead times are independent of demand is equally risky when seasonal peaks hit a shared corridor.[S24]
Q placed during demand spikes take longer to dye, finish (T2 to T3) and inspect (T9 to T10).[S07] [S24]Under independent daily demand (mean mu_D, variance sigma_D^2) and independent random lead time (mean mu_L, variance sigma_L^2), lead-time demand variance is Var(D_L)_ind = mu_L * sigma_D^2 + (mu_D^2) * (sigma_L^2).[S05] [S24] For an illustrative uniform fabric with mu_D = 200 metres per day, sigma_D = 30 metres per day and mu_L = 30 days, assuming a constant lead time (sigma_L = 0) gives a standard deviation of sqrt(30 * 30^2) = 164.3 metres, whereas a modest lead-time standard deviation of sigma_L = 6 days raises the standard deviation to sqrt(27,000 + 1,440,000) = 1,211.2 metres, more than seven times larger.[S05] [S24] When high daily demand (240 illustrative metres) coincides with peak-season lead times (38 illustrative days, requiring 9,120 metres) rather than off-peak lead times (160 metres over 22 days, or 3,520 metres), positive covariance pushes the upper tail even higher.[S05] [S24]
Planners must first strip predictable calendar shifts from demand using the companion forecasting framework (WP04) and time-phased scheduling so safety stock covers only unpredicted forecast residuals.[S04] [S05] [S07] GFT then requires checking rank correlation between L_k, demand residuals, lot size Q_k and vendor backlog, stratifying parameters by dry versus rainy/peak season or passing joint (D_L, L) scenarios to the Chapter 5 quantile calculator.[S05] [S23] [S24]
4.16
Northern corridor FCA truck
Northern corridor FCA truck: External border and maritime tail-risk exposure 3, Direct factory timestamp visibility and control 8.2. Quadrant: Controlled domestic corridors · illustrative
Switching a purchase contract from Ex Works (EXW) or Free On Board (FOB) to Cost, Insurance and Freight (CIF) or Delivered Duty Paid (DDP) does not shorten physical transit.
Local packaging DAP gate
Local packaging DAP gate: External border and maritime tail-risk exposure 1.8, Direct factory timestamp visibility and control 7.5. Quadrant: Controlled domestic corridors · illustrative
Douala/Kribi FCA forwarder
Douala/Kribi FCA forwarder: External border and maritime tail-risk exposure 7.8, Direct factory timestamp visibility and control 7.6. Quadrant: Instrumented import corridors · illustrative
Emergency air FCA airport
Emergency air FCA airport: External border and maritime tail-risk exposure 5.2, Direct factory timestamp visibility and control 8.5. Quadrant: Instrumented import corridors · illustrative
Overseas CIF vendor-arranged
Overseas CIF vendor-arranged: External border and maritime tail-risk exposure 8.4, Direct factory timestamp visibility and control 2.8. Quadrant: Blind long-distance imports · illustrative
Unmonitored trader spot buy
Unmonitored trader spot buy: External border and maritime tail-risk exposure 3.5, Direct factory timestamp visibility and control 2.5. Quadrant: Opaque local spot buys · illustrative
The method behind it: Warning.
Illustrative scoring of six sourcing route archetypes on two planning dimensions: x = External border and maritime tail-risk exposure (0 = minimal border friction, 10 = multi-ocean transshipment plus full customs clearance); y = Direct factory visibility and control over transit timestamps under standard contracts (0 = opaque vendor-arranged chain, 10 = direct factory/forwarder telemetry). Basis: S12, S14, S29, S30.
Unit: illustrative index (0 to 10). Status: illustrative. Sources: S12, S14, S29, S30. Illustrative figures are teaching examples, not measured factory results.
4.16 · the bodyExhibit 18 above; its figures are illustrative where marked.
Switching a purchase contract from Ex Works (EXW) or Free On Board (FOB) to Cost, Insurance and Freight (CIF) or Delivered Duty Paid (DDP) does not shorten physical transit.[S29] The International Chamber of Commerce (ICC) Incoterms 2020 rules govern the contractual division of cost, risk and carriage responsibilities, noting that "It recognises that not all commercial trade transactions from the seller to the buyer are conducted by a third-party carrier."[S29] Every contract must specify the rule edition and named place (such as FCA Ningbo Terminal, Incoterms 2020), but all ten physical stages from T0 to T10 still occur:[S29]
EXW or FCA (origin): The buyer's forwarder controls main carriage (T4 to T5), port clearance (T6 to T7) and inland haulage (T8), giving the factory direct timestamp visibility alongside transit risk.[S12] [S29]CPT, CIP, CFR or CIF (destination port): The seller pays main carriage while risk transfers at origin handover, which can leave the buyer blind to transshipment rollovers during T4 to T5 unless milestone reporting is mandated, while the buyer still owns customs clearance (T6 to T7) and haulage (T8).[S12] [S29]DAP, DPU or DDP (factory gate): The seller bears delivery responsibility to the destination, yet an overseas mill lacking licensed customs capability in Cameroon can lengthen T6 and T7 under DDP, and receiving (T9) plus quality release (T10) remain inside the buyer's clock.[S13] [S29] [S30]Furthermore, Incoterms 2020 rules do not govern title transfer, payment timing or breach remedies, which require separate contract clauses and legal review (not legal or tax advice).[S08] [S29] Documentary and financing clocks directly affect port release (T6 to T7): delayed original bills of lading hold containers at T6; post-shipment receivables finance such as the International Finance Corporation's Global Trade Supplier Finance programme ("The GTSF Program provides post-shipment finance to suppliers based upon acceptance of receivables by select buyers approved by IFC.") does not fund pre-shipment buyer deposits at T1 or import duties at T7; and under IAS 2 Inventories ("Inventories are measured at the lower of cost and net realisable value."), goods in transit may sit on the balance sheet weeks before passing T10.[S09] [S18] [S29]
How route and contract choices reshape risk exposure and timestamp visibility across six sourcing archetypes is mapped in Exhibit 18.[S12] [S14] [S29]
Exhibit 18 contrasts external border and maritime tail exposure (x) with direct factory timestamp visibility (y).[S12] [S29] An overseas CIF order with vendor-arranged shipping sits in Blind long-distance imports (illustrative score x = 8.4, y = 2.8), whereas pairing an FCA contract with forwarder milestone telemetry moves the lane into Instrumented import corridors (x = 7.8, y = 7.6).[S29] [S30] Domestic movements (Northern corridor FCA truck, x = 3.0, y = 8.2) avoid maritime and customs stages (T6 to T7) but require inland road monitoring (T8).[R03] [S12] These illustrative scores do not rank specific Cameroon ports or carriers; they specify the telemetry required for each route.[S14] [S29]
4.17
When a lead-time audit shows an illustrative 65-day 90th percentile against a 40-day median, buying 25 extra days of safety stock ties up cash and increases obsolescence risk.[S05] [S06] [S09] Because the lead-time term in demand variance scales with mu_D^2 * sigma_L^2, halving sigma_L removes 75 percent (1 - 0.5^2 = 0.75) of lead-time-driven variance without adding a metre of stock.[S05] [S24]
When a lead-time audit shows an illustrative 65-day 90th percentile against a 40-day median
S05, S06, S09, S05, S24 · illustrative
Engineering management should target four procedural bottlenecks before expanding buffers:
T5 to T7): Article 7.1 of the WTO Trade Facilitation Agreement requires procedures "allowing for the submission of import documentation and other required information, including manifests, in order to begin processing prior to the arrival of goods with a view to expediting the release of goods upon arrival."[S0401] Enforcing a document-complete gate at vessel departure (T4) at least 5 illustrative days before berthing eliminates avoidable declaration delays at T6.[S30] [S0401]T6 to T7): Using WTO TFA Article 7.3 surety release mechanisms, clean HS-code master tables and pre-funded duty accounts prevents routine valuation queries from causing 15-day container holds.[S30] [S0401]T3 and T9 to T10): Inspecting physical or calibrated digital shade cuttings from production rolls at T3 before container sealing prevents full-order replacement delays at T9.[S07] [S27] [S31] (Where high-volume lines later evaluate automated optical inspection, sector literature in [^R29] reports manual accuracy of 60 to 70 percent versus computer vision above 90 percent at up to 60 metres a minute, which remains a separate WP06 decision.)[R29]T0 to T2): Replacing ad-hoc payment sign-offs (which can add 1 to 11 illustrative days of administrative jitter) with a fixed twice-weekly approval cadence bounds T0-to-T2 within 48 hours.[S07] [S18]Finally, GFT enforces an asymmetric lead-time ratcheting rule (linked to Chapter 12 and Chapter 13): upward delay shifts observed in right-censored or completed orders trigger immediate protection reviews, whereas a promised lead-time reduction may not reduce the reorder-point parameter mu_L or P90 until verified across at least one full seasonal cycle and 10 consecutive uncensored shipments, releasing any resulting buffer reduction in two staged steps as fill rate and complete-kit readiness hold steady.[S05] [S22] [S23] [S30]
Check the record
Every knot is a source this chapter cites; select one to read its record, or filter the register by grade. Publication dates and inherited-source limits stay explicit. Read the paper's full evidence summary.
30 sources · 258 citation marks on this pageMost cited: S30, 38 times
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All 30 records shown
R01 · Grade C · inherited record
Inherited evidence R01
Cameroon seed-cotton production 2022-2024: 330,000 t (2022), 314,455 t (2023), about 340,000 t (2024).
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R03 · Grade C · inherited record
Inherited evidence R03
Company profile: more than 220,000 cotton producers supported in northern Cameroon; nine ginning plants; two oil mills.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R06 · Grade C · inherited record
Inherited evidence R06
About 95 percent of cotton fibre exported raw against 5 percent processed locally; industrialisation target of 50 percent local processing.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R07 · Grade C · inherited record
Inherited evidence R07
SND30 restates the 50 percent local-processing target by 2030.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R09 · Grade C · inherited record
Inherited evidence R09
Camtext SA integrated cotton-to-textile project, US$300 million (180 billion XAF); Panafritex and Arise with SODECOTON, CNPS and Marlo; 12 November 2025.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R10 · Grade C · inherited record
Inherited evidence R10
Camtext SA: 12,000 t a year processed; about 12,000 jobs at the Dibamba hub and 3,000 at Garoua; return on investment near 11 years; optimal capacity around 2033.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R12 · Grade C · inherited record
Inherited evidence R12
CICAM capacity utilisation, July 2023 report: Garoua 33.7 percent, CICAM 1 48.9 percent, CICAM 2 10.83 percent; underutilisation cost about CFAF 2 billion in 2020.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R16 · Grade C · inherited record
Inherited evidence R16
Informal share of employment about 90 percent; standard 40-hour week, 48-hour maximum, overtime at 1.2 times.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R29 · Grade C · inherited record
Inherited evidence R29
Manual defect inspection 60 to 70 percent accurate, missing 20 to 30 percent of defects; computer vision above 90 percent across more than 40 defect types; line-scan inspection up to 60 metres a minute.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
c04-S04 · Grade B
Inventory management III: Time-varying demand
This resource contains lecture slides on inventory management and time-varying demand (fixed horizon).
2006. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S05 · Grade B
Inventory management IV: Probabilistic demand and safety stock
This resource contains lecture slides on inventory management, probabilistic demand, and safety stock.
2006. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S06 · Grade B
Inventory management VI: Fashion, style and perishable goods
These may include revenue from salvage or cost associated with disposal.
2006. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S07 · Grade B
Inventory management VII: MRP and DRP systems
This resource contains lecture slides on inventory management and MRP and DRP systems.
2006. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S08 · Grade B
Supply chain contracts
This resource contains lecture slides on supply chain contracts.
2006. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S09 · Grade A
IAS 2 Inventories
Inventories are measured at the lower of cost and net realisable value.
n.d.. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S12 · Grade B
Logistics Performance Indicators: LPI Report 2025
Supply chains are only as good as their weakest link.
2025. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S13 · Grade A
Trade facilitation
The TFA contains provisions for expediting the movement, release and clearance of goods, including goods in transit.
n.d.. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S14 · Grade B
Revisiting the Sources of Growth: Enhancing the Efficiency of the Port of Douala
This was mainly due to a lack of investment and the absence of routine dredging.
2015-02-12. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S15 · Grade B
The Performance and Reliability of a RFID Cycle-Count: A Quantitative Approach from Fashion Retail
As a starting point, we compare in the present study the quality of a RFID cycle-count to a physically conducted count.
2013. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S18 · Grade B
Global Trade Supplier Finance
The GTSF Program provides post-shipment finance to suppliers based upon acceptance of receivables by select buyers approved by IFC.
2026. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S22 · Grade B
Learning to Order for Inventory Systems with Lost Sales and Uncertain Supplies
A key challenge in this learning problem is that both demand and supply data can be censored; hence only truncated values are observable.
2023-10-31. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S23 · Grade B
Inventory Management Under Stochastic Demand: A Simulation-Optimization Approach
The integration of random and conditional sampling techniques highlights critical periods of high demand, providing deeper insights into demand patterns.
2024-06-27. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S24 · Grade B
The impact of stochastic lead times on the bullwhip effect
The assumption that the lead time is constant is rather unrealistic.
2015-03-20. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S25 · Grade A
Due diligence essentials for responsible garment and footwear
Subcontracting is also common practice in the sector.
2026-02-26. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S27 · Grade A
INV-44 Cycle Counting Process
The cycle counting process is used to assess stock levels within an inventory organization and correct any discrepancies.
2023-10-24. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S29 · Grade B
Incoterms 2020
It recognises that not all commercial trade transactions from the seller to the buyer are conducted by a third-party carrier.
2020. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S30 · Grade A
Time Release Study Guide: Version 4
Improvements have been made to questionnaire design and sampling techniques to ensure data accuracy.
2025. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S31 · Grade B
EPC/RFID Data Exchange Study: Project Zipper Executive Summary
During the one-year study, Auburn University’s RFID Lab team examined the data obtained from eight brand owners and five retailers.
2018. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S0401 · Grade A
Agreement on Trade Facilitation
Each Member shall adopt or maintain procedures allowing for the submission of import documentation and other required information, including manifests, in order to begin processing prior to the arrival of goods with a view to expediting the release of goods upon arrival.
2017-02-22. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c04-S0402 · Grade A
NIST/SEMATECH e-Handbook of Statistical Methods: Section 8.2.1.5 Empirical model fitting, distribution free (Kaplan-Meier) approach
No underlying model (such as Weibull or lognormal) is assumed; K-M estimation is an empirical (non-parametric) procedure.
2012-04. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
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S30 World Customs Organization. 2025.
S12 World Bank. 2025.
S22 arXiv, Chen, Jiang, Zhang and Zhou. 2023-10-31.
S05 MIT OpenCourseWare. 2006.
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R07 Ecofin Agency. Publication date unrecorded; inherited source-text check.
S14 World Bank. 2015-02-12.
S29 International Chamber of Commerce. 2020.
S31 GS1 US and Auburn University RFID Lab. 2018.
S18 International Finance Corporation. 2026.
S08 MIT OpenCourseWare. 2006.
S25 OECD. 2026-02-26.
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S0401 World Trade Organization. 2017-02-22.
S15 Association for Information Systems Electronic Library. 2013.
S27 North Carolina Office of the State Controller. 2023-10-24.
R16 WageIndicator. Publication date unrecorded; inherited source-text check.
R03 SODECOTON. Publication date unrecorded; inherited source-text check.
R09 Ecofin Agency. Publication date unrecorded; inherited source-text check.
R10 Ecofin Agency. Publication date unrecorded; inherited source-text check.
S0402 National Institute of Standards and Technology. 2012-04.
S24 arXiv, Michna, Nielsen and Nielsen. 2015-03-20.
S23 arXiv, Sarit Maitra. 2024-06-27.
R01 Business in Cameroon. Publication date unrecorded; inherited source-text check.
S04 MIT OpenCourseWare. 2006.
S09 IFRS Foundation. n.d..
R12 Business in Cameroon. Publication date unrecorded; inherited source-text check.
S06 MIT OpenCourseWare. 2006.
R29 MDPI; industry inspection literature. Publication date unrecorded; inherited source-text check.
Keep the thread · chapter 04 of 14
Move the shuttle along the rack to preview any chapter: its sections, exhibits and reading time. Draft web edition. This research is not investment, legal or tax advice; illustrative models are not measured factory results.
The paper's rack · 14 boltsBolt length: reading time
01Part I: Define the stock decision before buying the stock
GFT argues for measured, cash-constrained inventory decisions that protect usable material and customer commitments without manufacturing surplus.
02Part I: Define the stock decision before buying the stock
An inventory policy fails when it orders against quantities that are wrongly identified, reserved twice or unavailable for use.
03Part I: Define the stock decision before buying the stock
A high-value fashion line, a low-cost line-stopping trim and a repeat uniform fabric need different decision rules.
04Part II: Match replenishment rules to material and demand
The relevant lead time ends when approved material is usable, not when a supplier announces that it has shipped.
05Part II: Match replenishment rules to material and demand
Calculate protection against uncertainty with consistent time units, explicit service definitions and checks for non-normal or dependent demand.
06Part II: Match replenishment rules to material and demand
Order quantity must reflect holding costs, pack sizes, supplier minimums, time-phased needs and available cash.
07Part II: Match replenishment rules to material and demand
Limited selling windows make overage, underage and replenishment opportunities central to the order decision.
08Part III: Resolve constraints across the supply chain
Inventory optimisation must respect dependent material requirements, quality release and finite conversion capacity.
09Part III: Resolve constraints across the supply chain
Centralisation and postponement can reduce duplicated buffers while increasing transit time, concentration and conversion risk.
10Part III: Resolve constraints across the supply chain
Procurement should price usable delivery and shared risk rather than reward low quotes that create expensive disruption.
11Part III: Resolve constraints across the supply chain
A decision that reduces expected shortages may still be unaffordable once deposits, transit stock and receivables are included.
12Part IV: Prove the policy before widening its authority
A small transparent policy engine is more useful than an opaque optimiser that cannot explain missing data or infeasible orders.
13Part IV: Prove the policy before widening its authority
Backtests, simulations and a controlled operating pilot answer different questions and must be reported separately.
14Part IV: Prove the policy before widening its authority
GFT would implement a phased inventory decision system whose authority grows only with measured reliability, service and cash evidence.