Data migration has no shortage of war stories. Most practitioners can describe, in vivid detail, the project where extraction took three times longer than promised, or where a quality problem only surfaced the weekend of cutover. These stories are useful for morale and for warning, but they have a structural weakness: they do not transfer.
A war story helps the team that hears it, in the moment. It rarely changes what the next team does, because the lesson is locked inside a specific narrative rather than expressed as a practice. So the industry keeps paying for the same mistakes, retold as fresh disasters.
The shift that matters is from anecdote to artefact. The same hard-won insight that makes a good story can usually be expressed as something reusable:
- a discovery checklist that names the dependency someone missed,
- a Data Quality Rule that encodes the defect that caused the late surprise,
- a mapping document that forces the assumption into the open before it becomes a dispute,
- a clear statement of ownership that prevents the handoff that went wrong last time.
This is the quiet superpower of a method. PDM gives practitioners a shared language and a set of standard artefacts so that a lesson learned once can be written down in a form the whole field recognises and applies. The story becomes a template. The template becomes practice. The practice becomes the new baseline.
There is a business case underneath the craft point. Reusable practice is how an organisation, and a profession, stops relying on a handful of scarred veterans and starts compounding its capability. It lowers the cost of every subsequent migration because the team no longer rediscovers the basics under pressure.
The community angle matters too. When practitioners share lessons as reusable practice rather than just entertainment, peer review becomes possible: others can challenge, refine, and improve the artefact. That is how a discipline matures, rather than simply ageing.
Pick your best war story. What is the single reusable artefact, a checklist, a rule, a mapping, that would have prevented it for everyone, not just you?
Share the artefact behind your story, and help turn one private lesson into shared practice.