Sample frameDay 229·Operations · Structure

Nobody in your business ever chose the way work moves through it. It accumulated.

Operations.

The Product-Process Matrix

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The question

How many jobs did your operation deliver last quarter, and how many of those needed a step your standard path doesn't have — and was the way your work is organised designed for that pair of numbers, or for the pair you had the day you set it up? Whenever the honest answer is the second one, the gap between those two pairs is coming out of your margin every week, in a line nobody can quite locate.

The idea

Almost everything that matters about how work moves through a business comes down to a diagonal line on a single grid. The grid appeared in the Harvard Business Review in 1979, when Robert Hayes and Steven Wheelwright published 'Link Manufacturing Process and Product Life Cycles' — a piece that has outlasted most of what was written about factories that decade. Down one side sit four ways of organising work: the job shop, where every order takes its own route; the batch, where similar jobs are grouped and run in lots; the line, where a fixed sequence handles a few high-volume products; and continuous flow, where the thing never stops. Across the other sits the product itself — one-off and bespoke at one end, standardised and high-volume at the other. What matters is the diagonal. Low volume with high variety belongs in a job shop; high volume with low variety belongs on a line. Businesses in trouble are rarely bad at the work; they've drifted off the diagonal and are running one structure while selling the other. The trap is that the drift is invisible from inside it: there's no meeting where it gets decided, no line in the accounts where it shows up, and it usually becomes obvious only when somebody else prices you out of your own category.

The framework

01
Your two numbers are volume and variety.
Two numbers place you on the grid, and almost nobody's written them down: how much you produced last quarter, and how much of it deviated from the standard path. Count the second one properly — every job that needed a bespoke quote, a custom step, a conversation with the founder, or a departure from the usual sequence. Percentages beat anecdotes here, because everyone in the business has a story about the difficult customer and nobody knows whether that customer's one job in fifty or one in four.
02
The four structures, and what each one is honestly good at.
Each structure buys something different, and each one charges for it. A job shop routes every order individually: maximum variety, high cost per unit, and quoting as a permanent overhead. A batch groups similar work and runs it in lots: cheaper, less flexible, and it's paid for with waiting between lots. A line runs a fixed sequence for a few products at volume: lowest cost per unit, almost no tolerance for the unusual. Continuous flow never stops at all. The same ladder runs through services — a bespoke consultancy is a job shop, a clinic running fixed appointment types is a line.
03
Which corner are you drifting towards?
There are only two ways off the diagonal, and both are quiet. Drift one way and you're doing high-volume work in a job shop: volume grew, the bespoke habits stayed, and you're still building every order from scratch at a cost your competitors stopped paying years ago. Drift the other and you're forcing low-volume, high-variety work through a process tightened for standard products, where every exception becomes a fight, a workaround, or a promise someone downstream can't keep. Look at where your margin has been going and you'll usually know which one you are.
04
Move the process, or move the product — but choose one.
Both ways back are legitimate; choosing neither is what costs you. Move the process and you rebuild the work around what you now actually sell: standardise the sequence, and put the genuinely bespoke jobs into a separate stream with their own people and their own prices. Move the product and you narrow what you'll take on, or price the unusual work at what it really costs, until the mix comes back to what your structure handles well. Hayes and Wheelwright's argument was that this choice is strategic rather than clerical, because it decides what you're good at.

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