6.3 · Best practices & pitfalls

Level 6 · In Practice

6.3Best practices & pitfalls

Goal: Adopt the purchasing/supply reflexes that secure cost, lead time and quality, and avoid the costliest mistakes.
Estimated time: 10 min · If you only have 5 min: read “The essentials in 30s” + the diagram.

The essentials in 30 seconds

  • Golden rule: challenge the need, reason in landed TCO, measure real lead time and lock P2P — that makes most of the result.
  • Do: second source on critical, shared forecasts, ABC/XYZ segmentation, OTIF steering on both sides.
  • Never do: systematic lowest bidder, delivery note signed unchecked, payment with no match, all-push or all-pull by dogma.

Nadia thread — 1 year on: three habits that pay

One year on, Nadia reviews: what counted most was not a tool, but three habits — the need challenged before each consultation, the three-way match before each payment, and the second source qualified when all was well. And her biggest pitfall narrowly avoided: signing a loaded delivery note with no reservations on a rush day.

Pick a single habit to anchor in an existing ritual, then move to the next.

The difference between enduring and steering

A solid chain does not rest on a miracle tool but on a few repeated disciplines. The challenged need, TCO, real lead time and three-way match deliver 80% of the result.

The pitfalls below are so frequent they deserve to be posted on the wall: recognising them already neutralises them.

✓ Do

  • Challenge the need before tendering: restate as expected outcome, hunt over-specification and imposed brands — 30% of savings are decided here.
  • Think in landed TCO (price + transport + customs + warehousing + non-quality + risk) to compare on identical scope, not in catalogue price.
  • Measure and record the real lead time (order → available) and its variability: it sizes every stock and threshold.
  • Qualify a second source on each critical item (70/30) before you need it: safety is prepared when all is well.
  • Lock P2P: no purchase without a PO, no receipt without a check and written reservations, no payment without a three-way match.
  • Share forecasts and stock levels with key suppliers: transparency smooths the bullwhip effect better than last-minute pressure.
  • Segment by ABC/XYZ to differentiate management: strong safety and negotiation on critical A items, lean handling on regular C items.
  • Steer by OTIF (on time and complete) on both sides: supplier OTIF and customer OTIF are two faces of the same reliability.

✗ Avoid

  • Picking the lowest bidder instead of best value: the lowest price without services becomes the dearest at TCO once transport, after-sales and delays are added.
  • Confusing catalogue lead time with real lead time: sizing stock on 14 announced days when reality is 21 days guarantees a stockout.
  • Signing the delivery note unchecked: a delivery signed with no precise reservations is deemed compliant — recourse almost lost, especially against the carrier.
  • Letting MOQs dictate quantities: accepting 6 months of stock by default ties up cash for an illusory unit saving.
  • Staying single-sourced for comfort: with no qualified alternative, every renegotiation is lost in advance and every hazard turns critical.
  • Consulting a single supplier out of habit: with no 3 to 5 comparable offers on identical scope, you have no market information.
  • Paying on invoice alone with no match: price errors, duplicate invoices and forgotten discounts go unnoticed for months.
  • Running 100% push or 100% pull flow by dogma: the mix (buffer stock on regulars, pull on uncertain demand) beats extremes almost every time.
Common misinterpretation: "tick every box every day". No. These are habits to install one by one: pick one (e.g. three-way match), anchor it in an existing ritual, then move to the next.

Ready-to-say script — refuse the lowest bidder (1 min)

"The cheapest on price often becomes the most expensive on arrival once transport, storage and delays are added. I compare at landed TCO on identical scope and choose best value."

Copy-paste template — monthly self-check (8 questions)

THIS MONTH (yes / to improve):
1. Need: did I challenge before consulting?
2. TCO: did I compare at identical landed scope?
3. Lead time: real measured or catalogue lead time?
4. Second source: qualified on critical?
5. P2P: PO, delivery-note check, match before payment?
6. MOQ: challenged or suffered?
7. Forecasts: shared with key suppliers?
8. KPI: supplier and customer OTIF tracked?
MY PRIORITY NEXT MONTH (only one): ...

Small business / tight budget

One habit per quarter is enough: three-way match first, the rest after.

Algeria SME

Fit rituals to peaks and trips (port, bank, wilaya): a habit that survives rush beats ten resolutions.

Import / distant

The #1 discipline for import: written confirmation with INCOTERMS and enforceable lead time, no exception.

Growing team

Post the 8 reflexes on the wall and name a keeper per ritual (order, receipt, KPI review).

48h challenge — apply tomorrow

Fill the monthly self-check above and pick a single priority to anchor in an existing ritual.

Section exit checklist
  • I know the 8 reflexes to apply and the 8 pitfalls to avoid.
  • I filled the self-check and picked one priority.
  • I did the 48h challenge or scheduled its date.
Self-rating 1-5: consistency of good reflexes?pitfalls avoided?
Check your understanding

Nadia gets an offer 12% cheaper with no transport or warranty: which reflex avoids the lowest-bidder trap?

💡

Quick test: if you redo the same manual fix more than twice (chase, credit, dispute), automate the cause (threshold, contract, grid) instead of enduring the effect.