Step 7 of 8

REFY · then refine

Fit — exactly one lever, cleanly wired

F is the step many projects mistake for the whole thing. It is the seventh of eight, and everything before it is the reason it can stay small: the bottleneck is named, the ballast is gone, ownership is settled. What remains is a change in one place.

Limiting it to one lever is not modesty, it is a precondition for Y. Two simultaneous changes cannot be separated in the re-measurement; afterwards nobody knows which one worked, and the next cycle starts from a guess.

Answers the question
Which single technical lever gets built, and how is it wired in?
What the step produces
One implemented change at one point, connected to the systems already running, with documented behaviour on failure.

How the step is carried out

  1. Take the lever from W, not the obvious one

    W made a decision, against cost and with a payback period. Building something else here because it presented itself along the way bypasses that decision and invalidates the calculation.

  2. Connect rather than replace

    The spreadsheet stays the spreadsheet, the ERP stays the ERP. A system replacement is a project of its own, with its own business case, its own risk and a duration that breaks this cycle. It belongs as a candidate in a new F, not in this one.

  3. Act at the break point

    The lever goes where O named the bottleneck — typically a media break, a waiting loop or a manual transfer. An intervention anywhere else accelerates a step that was not the constraint and leaves lead time unchanged.

  4. Build the failure path

    What happens when the connection is up but the far end does not answer? An intervention without a fallback moves the bottleneck into operations: the process is faster in the normal case and blocked in the exceptional one, and the exceptional case turns up more often than the plan allowed for.

  5. Exactly one lever

    If a second idea appears during implementation, it gets written down and assessed in the next cycle. Not built.

Finished when

  • The lever runs in daily operation, not only in a test.
  • There is a documented path for what happens when the connection fails, and somebody who knows it.
  • No existing system had to be replaced.
  • It is exactly one change. If it is two, the re-measurement in Y can no longer be attributed.
  • The old route is either switched off or carries a date for switching off — two routes running in parallel is not a changeover, it is duplicated work.

The typical mistake

Three levers at once

It is tempting while you are already inside the process, and it feels efficient. The price only lands in Y: the process is faster and nobody can say from what. The next cycle then reopens the same debate as the first, with more opinions and a larger stack of tools for somebody to maintain.

Calculator

What you can compute yourself

The automation check settles before construction whether the lever will hold technically: data quality, exceptions, interfaces, volume. It does not replace the implementation, but it prevents implementing at a point that has no interface.

FLOWREFYmeasurerefineFFindLLay bareOObserveWWeighRReduceEEnableFFitYYield
ABB. 01Eight steps clockwise. The right half measures, the left half refines; after Y the cycle starts again at F. Highlighted: Fit.
FAQ

Questions

Because a replacement is a project of its own: its own business case, its own risk, a duration that breaks the cycle, and a data migration that has never once matched its estimate. This step is about the single bottleneck O named. If the replacement is worth it, it enters a new F as a candidate and gets costed against the others there.

Then it is not a lever but a development project, and the calculation from W no longer holds. The right move is back to W with the real costs — not forward on the hope that it will work out.

No. A lever can be a changed sequence, a form with mandatory fields, or an automatic notification replacing a chase. What matters is that it acts at the point O named and that its effect is measurable in Y.

If you want to know what your process costs: measure it.

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