The Conversion List Is Not the Savings List

The review that reprices the program

I spent a call recently walking a packaging conversion list box by box with the operations contact who owns it. The program was straightforward on paper: move a set of die cut cartons to a standard regular slotted container, a cheaper format for the same job.

Item by item, here is what came back. Two boxes passed testing outright. One was pulled on the recommendation of the product side. One died because the product it packed died. One passed on every dimension except a single item, which means both the old and the new box stay in the system. And on at least one line, once board prices moved during testing, the original die cut carton came back cheaper than the converted one.

Nobody made a mistake anywhere in that sequence. Every decision was the right local call. The list simply stopped being the list, and no document anywhere had been updated to say so. The test results were sitting with the supplier waiting for a response, the tracking file had picked up new part numbers for the items that converted, and the savings number everyone was still quoting belonged to a version of the program that no longer existed.

A failed package test comes back as a price, not as a no

This is the part that surprises operators the first time, and it is the whole mechanism.

When a converted box fails a crush or drop test, there are two physical remedies. Reduce the pallet quantity, which lowers the load the bottom carton carries, or increase the board caliper, which raises what the carton can take.

Pallet quantity is almost never available. It is load bearing downstream: truck cube, warehouse slotting, customer pallet standards, case counts printed on paperwork you do not control. So nobody cuts pallet quantity, and in practice they say so out loud. That leaves caliper.

Caliper is price. So a failure does not remove the line from your list. It returns the same conversion at a worse number, and now you are making an invest or defer decision on economics you never quoted. Sometimes the retested spec still beats the incumbent carton. Sometimes it does not, and you learn that only after the testing cycle is spent.

The partial pass is the quieter version of the same problem. A box that passes on every item it packs except one does not convert. You keep both formats, which means two part numbers, two minimum order quantities, two slots, and two forecasts, in exchange for a saving that now applies to a fraction of the volume. Counted honestly, a partial pass is usually a cost.

Both failure shapes share a timing property that makes them worse. Testing takes weeks. Board markets move inside those weeks. You are comparing a freshly retested price against a baseline that has also moved, and if the baseline in your file is the one you built at kickoff, the arithmetic will show you savings the market has already taken back.

Why this is frequently the only lever you have

None of this is optional work you could skip in favor of a cleaner approach, and that is worth saying plainly.

On another engagement, the client's corrugated supplier was under contract with roughly eighteen months left to run. That single fact settles the strategy. You cannot take the category to market. The supplier is fixed, which means the specification is the only variable in the system. Every dollar available in that phase has to come out of changing what gets bought and having the incumbent reprice it.

So the entire value of that phase rides on the survival rate of a specification change list. Not on negotiation, not on supplier selection, on how many converted items are still standing after testing and at what price.

My rule going into that kind of phase is explicit: do not chase optimization on items that are not worth it. That sounds obvious and it is routinely violated, because the list usually gets built from what is easy to convert rather than from what carries volume. You need the same data you would gather for a full market event before you pick a single item to test: current spend, current specifications, current pricing, current volumes. Optimization is not the cheap version of sourcing. It needs the same fact base, because every item you put into testing consumes supplier engineering attention and internal quality attention that you cannot refill on demand. Spending that attention on a low volume carton is the most common way these programs end with a real conversion rate and no financial result.

Running the list so the number survives contact

Five changes make the difference between a conversion program and a conversion proposal.

Price every line at its tested specification, not its quoted one. The moment a retest comes back at a heavier caliper, that line's economics are replaced, not annotated.

Decide the caliper rule before testing starts. If pallet quantity is genuinely fixed, say so in writing, and set the threshold at which a heavier board stops being worth converting. Otherwise that decision gets made item by item, under time pressure, by whoever happens to be on the call.

Treat a dual format retention as a cost line, not a neutral outcome. Any item that keeps both part numbers comes off the savings total unless the split volume still clears your threshold on its own.

Own the interval between the test result and the shipped part number. In the conversion review I opened with, the results had been handed to the supplier and had been sitting there. That is not unusual and it is not anyone acting in bad faith. The handoff had no owner on the client side and no date, so it aged. Someone on your side holds that clock.

Recompute against a current baseline every time you report the number. In a moving material market the only honest comparison is the current incumbent price against the current converted price. A kickoff baseline flatters everything downstream of it.

What a well run conversion program reads like

Every line on the list shows a state and a date: passed at quoted spec, passed at retested spec with the current price attached, failed, or dual format retained. Nothing sits in testing past the stated window without a named owner and a next date. Converted items are tracked by their new part number, and the program total is computed from shipped part numbers rather than from approvals. Dual format retentions appear in the total as a subtraction. The baseline is refreshed on the same cadence as the report, so the savings figure and the market it lives in are never more than one cycle apart.

The next decision is the one to take today. Open the current list, and for each line write the shipped part number or the reason there is not one yet. The lines with no answer are where your program actually stands.