Supplier change decision matrix template: switch, stop or stay

This decision matrix covers a change of grade, supplier or source, a discontinuation, or keeping a product as is, where the result shows late and undoing it costs time or requalification. It does not replace a customer's change approval process, a regulatory check of the new grade, or a cause or suitability investigation that has to be settled first.

When should you use a supplier change decision matrix instead of a weighted scoring matrix?

Use a supplier change decision matrix instead of a weighted scoring matrix when the choice is hard to reverse and its results arrive late: a grade change, a supplier or source change, a discontinuation, or keeping a product its maker is phasing out. A weighted scoring matrix rates each supplier on criteria such as price, quality and delivery and adds the scores. That works when the options are known suppliers for one item and a poor pick is corrected at the next order.

A grade change or a discontinuation breaks those conditions. The outcome depends on premises nobody has confirmed yet: how long the old grade stays available, how long requalification takes, whether the new grade behaves the same in the customer's process. A single score hides that spread. Supply conditions can move fast; Peter Kraljic warned purchasing managers that "supply and demand patterns can be upset virtually overnight" (Kraljic, Harvard Business Review, 1983).

Risk standards support looking at a range rather than a point. IEC 31010:2019 summarizes risk assessment techniques that "are used to assist in making decisions where there is uncertainty" (IEC 31010:2019). ISO 31000:2018, the risk management guidelines, outlines an approach to identifying, analyzing, evaluating, treating, monitoring and communicating risks, and ISO lists it as last reviewed and confirmed in 2023 (ISO 31000:2018). The supplier change decision matrix applies those ideas to one decision: it keeps each option's outcome as a range under four scenarios and records what would make the choice change.

What goes in each part of the supplier change decision matrix?

The supplier change decision matrix has four parts and a final check page with the nine decision steps, filled in order: the decision and its options, the outcome comparison under four scenarios, the premise register, and the recommendation with its reversal costs and early signals. The order matters because the decision and options are frozen before any scenario is projected, so the comparison cannot drift toward a preferred answer. Each part fits on one printed page, and parts 1 and 3 are filled from records before anyone writes an outcome.

The table below previews every part and column of the Word decision sheet, so you can see what each asks for before you fill it; all example values are illustrative.

The key row is part 2: every option, staying as is included, gets a base, upside, downside and stress outcome on all three axes, and the stress outcome is the two worst premises failing together. The editable Word decision sheet with these parts is at the end of this page.

Which options belong in a grade change or discontinuation decision, including staying as is?

A grade change or discontinuation decision needs at least three options on the sheet, and staying as is must be one of them, projected with its own decay rather than treated as a free default. Staying as is rarely stays the same: when a maker discontinues a grade, staying means living on remaining stock or a last-time buy, and its supply security falls month by month.

Typical options for a specialty chemical grade change are:

1. Stay as is on the current grade until stock or supply ends.

2. Make a last-time buy and hold stock, which adds storage, shelf life and cash tied up.

3. Switch to the maker's successor grade, with whatever requalification the customer requires.

4. Switch to another maker's grade, which changes the source and usually the documents.

5. Reformulate or change the process so the grade is no longer needed.

6. Stop supplying the product to that application.

Obsolescence management standards treat these as resolutions to be selected, not improvised. IEC 62402:2019 "provides requirements and guidance for obsolescence management applicable to any organization that is dependent on another organization to obtain value from the usefulness of the items that it provides", and its scope includes selecting an obsolescence resolution and implementing it (IEC 62402:2019). Its second edition, published on 29 May 2019, was written as requirements rather than as a guide (IEC, 2019).

List rejected options with the reason. Where an option's composition is undisclosed, compare it by trade name and say so.

How do you compare base, upside, downside and stress outcomes for each supplier change option?

Compare base, upside, downside and stress outcomes by writing, for every supplier change option, a low and a high result under each scenario on cost, supply security, and quality, safety and regulatory risk. Use words where no number exists. Do not attach probabilities: the sheet records how far each option can run, not how likely each end is.

Define the four scenarios once and apply them to every option:

1. Base: each premise as it is best known today.

2. Upside: the premises that would help the option hold.

3. Downside: the single premise that hurts the option most fails.

4. Stress: the two worst premises for that option fail together.

The stress scenario is the one weighted scoring grids leave out. A switch to a successor grade might survive a longer requalification or a price rise alone, but not both at once. Staying as is gets its own stress case too, for example the maker bringing the last order date forward while the customer's demand rises.

Mark each scenario's grounding: it weighs fully when it rests on confirmed premises, weighs with qualification when it rests on reported ones, and is speculative when it rests on assumptions. A speculative stress case with a high reversal cost still belongs in the comparison, because it is the case that cannot be undone. ISO 9001:2026, published on 16 September 2026, "separates risk and opportunities" (ISO 9001:2026), and the upside column is where an option's opportunities are written down beside its risks.

Which premise limits the supplier change recommendation most?

The premise that limits a supplier change recommendation most is the one that, if wrong, changes which option ranks first, and the sheet names it so the decider knows what to check before acting. Every premise goes into the premise register with its source, its as-of date and its status.

Use three statuses. Confirmed means a document you hold says so, such as a written discontinuation notice, a safety data sheet or a test report. Reported means a person told you, such as a sales contact giving a last order date by email. Assumed means it is your estimate. The premises that usually move a grade change are consumption, the customer's process window, stock on hand, lead time, the requalification period, the regulatory status of the new grade, the customer's acceptance criteria and the end date of supply.

Regulatory premises are often reported when they should be confirmed. In US workplaces, employers "shall have a safety data sheet in the workplace for each hazardous chemical which they use" (OSHA, 29 CFR 1910.1200(g)(1)), so a new grade needs its safety data sheet before first use there. The preparer of a safety data sheet must add newly learned significant hazard information within three months (OSHA, 29 CFR 1910.1200(g)(5)), so record the revision date of the sheet you relied on.

An untested premise is marked untested and keeps its row. The limiting premise is usually an assumed or reported one with a wide effect on the outcome.

Which early signals and reversal costs should a supplier change decision record?

A supplier change decision should record, for each option, the cost of reversing it in time, money and effect on the customer's process, with who bears that cost, and, for each scenario, the early signal that shows it is happening. Reversal cost separates a hard decision from an easy one: an option with a good base outcome and a very high reversal cost can still lose to one that is slightly worse but easy to undo.

Customer approval steps are a common reversal cost. For automotive customers, one change notification form asks suppliers to notify the buyer whenever customer notification is required by Table 3.1 of the AIAG PPAP Manual 4th edition, and lists "Bulk Materials: New source of raw material from new or existing supplier" among the reasons (Accuride Corporation, Form P100, 2012). AIAG describes PPAP as "the industry standard for defining the production part approval process to ensure engineering design record and specification requirements are consistently met" (AIAG, accessed 2026). A switch that needs a new approval, and a later switch back that needs another, adds that time to both directions.

Write each early signal with four parts: where it is observed, the threshold that triggers action, the response, and the option the stance moves to. Add the last date by which that move still costs what the sheet states. A signal without a threshold is a worry, not a signal, and the sheet should not be sent until each one has a number or a defined event.

Supplier change decision chart in numbered steps

The supplier change decision chart below runs in nine steps, from checking that the decision is hard to reverse to sending the sheet with its signals. Each step is a yes or no question; answer it from the sheet's own entries and move on as the table says.

The table decides, step by step, whether to change grade or supplier, discontinue or stay as is, and which signal would reverse the choice:

The key row is step 8: an option is recommended only when it leads on the base case and its stress outcome is still one the customer can live with; otherwise the sheet recommends the option that is cheapest to reverse and names the premise that would settle the choice.

Steps 1 and 2 stop the matrix being used for the wrong problem. Step 7 is where regulatory and customer approval time enters the comparison instead of surfacing after the decision.

Worked grade change decision example (illustrative)

The worked grade change decision example below is illustrative: the product, dates and values are invented to show how the sheet reads, not taken from a real case. A distributor supplies defoamer grade A to a coatings plant, and the maker has announced that grade A will be discontinued. The decision is whether to switch the plant to grade B, the maker's successor, to grade C from another maker, or to stay on grade A with a last-time buy.

The table compares the three options on the outcome indicator, months of uninterrupted supply, and on reversal cost; all values are illustrative:

The key row is grade B: its stress case, 12 months to approval in this illustrative example, still ends before the illustrative last-time buy of grade A runs out, at 13 months even under stress, so the sheet recommends grade B with a last-time buy as a bridge.

The limiting premise in this illustrative example is the trial result, which is assumed until the first trial batch is run. The early signal is the trial foam height against the plant's limit; if it is exceeded, the stance moves to a larger last-time buy while grade C is trialed.

How do you fill in the supplier change decision sheet?

Fill in the supplier change decision sheet in the order of its parts, and do not start part 2 until part 1 is agreed with the person who decides. Writing the outcomes first and the decision statement afterward is the most common way a matrix ends up justifying an answer chosen in advance.

1. Write the decision statement, the deadline and the decider in part 1. If the deadline is not known, write unconfirmed.

2. List every feasible option, staying as is included, and the rejected ones with reasons.

3. Fill the premise register in part 3 before projecting anything, with a source, an as-of date and a status for each premise. Ask the person who holds a missing premise once; if no answer comes, mark it assumed.

4. Fill part 2: four scenarios for each option on each axis, as ranges or words.

5. Name the limiting premise.

6. Fill part 4: the recommendation, the runner-up, the reversal cost of each option and the early signals with thresholds and last dates.

7. Run the nine decision steps against the filled sheet and correct what fails.

The Word sheet keeps the blank form and the illustrative example on separate pages, so the example is never sent by mistake. Review the sheet again when a signal crosses its threshold or a reported premise is confirmed.

Where does a supplier change decision matrix not apply?

A supplier change decision matrix does not apply when the decision is easy to reverse, when the decision statement or the options are still unclear, or when a cause or suitability question has to be answered first. An easily reversed choice, such as a trial order from a second distributor for a non-critical item, is decided faster with a weighted scoring matrix or a single order.

If a complaint is open or a trial is unfinished, settle that first; the matrix would otherwise rest on a premise that is really an unanswered technical question. The matrix also does not produce probabilities, approve a change on the customer's behalf or replace the customer's own change notification and approval process, and it is not a regulatory review of the new grade: the safety data sheet, the registration status in each jurisdiction where the grade is used and the customer's acceptance criteria still have to be checked against their own sources.

The sheet also assumes someone owns the decision. When nobody can say who decides or by when, the first task is to name that person, not to fill the matrix.

Lubinpla's feasibility review task works this kind of decision from your own documents and site history: it compares base, upside, downside and stress outcomes for every option, staying as is included, with early signals and the cost of reversing each, and returns one cited document recommending a provisional stance and its switching conditions for your review.

Key takeaways

• Use a supplier change decision matrix when a grade change, source change or discontinuation is slow or costly to reverse.

• Give staying as is the same base, upside, downside and stress scenarios as every change option.

• The stress scenario is the two worst premises failing together.

• Mark each premise confirmed, reported or assumed, and name the one that limits the recommendation.

• Record reversal cost and early signals with thresholds before the decision is sent.