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A New Platform Going Live Is Not the Same as Completing a Migration

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Somewhere in your organization, there is a slide that says the migration is 80 percent complete.

Ask a different question. Ask how many of the old systems have been switched off. Ask what the data center bill was last quarter compared to the one before the program started. In the migration programs I've been brought into over the last two decades, those two answers usually don't sit anywhere near the 80 percent on the slide.

That gap is the whole story. And I've come to think most migration programs are measured backwards.

The double-run tax

Here is what "80 percent migrated" usually means in practice. Eighty percent of the workloads have a new home. Containers are running. Pipelines are green. The dashboards look excellent.

Meanwhile, the legacy platform is still up, because a handful of things still depend on it. A nightly batch job nobody owns. A reporting extract that...

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