The three-week cliff (and why you never see it coming)
Last week we named the quiet way training fades. This week, let’s put a clock on it.
New behaviors tend to collapse within about three weeks of a training unless something deliberate is built to hold them in place. I call it the three-week cliff, and the important part is this: it’s predictable. Which means it’s preventable.
Here’s why the cliff shows up almost on schedule:
Old routines reassert themselves the previous way of working never left. The moment attention drifts, it quietly takes its seat back.
Competing priorities crowd in — calendars fill, the “important later” loses to the “urgent now,” and the new practice is the first thing to get deprioritized.
Support gets pulled too early — the initial enthusiasm gets mistaken for lasting change, so help is withdrawn at the exact moment it matters most.
Notice what’s not on that list: your people. This isn’t a motivation problem or a talent problem. It’s a design problem — in how the training was set up in the first place.
Two teams learn the same new coaching approach on the same day. Team A goes back to full calendars; by week three the practice is deprioritized, and within a month it’s gone.
Team B built in short weekly check-ins from the start. Same content, same week — but their behavior walked straight across the cliff. The only difference was reinforcement.
If you’ve watched a good initiative fade around week three, it wasn’t bad luck. It was a missing structure — and the right one can carry behavior clean across the gap.
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Think back to the last change you rolled out. Roughly when did it start slipping?