Boundary / transfer

Find out where the finding works, where it fails, and where it stops being safe to apply.

Spaced-repetition flashcards transformed your Spanish vocabulary, so now you're applying the same method to everything: calculus, negotiation, public speaking. Three weeks in, calculus is going strangely badly. You can recite the chain rule perfectly and still can't solve problems with it. The method didn't fail; you carried it past its border without checking for one.

Boundary / transfer is the evidence job of finding out where a finding works, where it fails, and where it stops being safe or useful to apply. Everything that works, works within limits, and the limits are rarely printed on the label. The cue is exporting a success from the context where you proved it into a context where you haven't. The operation: name what the original context provided (vocabulary is isolated fact-pairs, which is exactly what flashcards drill), name what the new context demands (calculus needs multi-step procedures applied to novel problems), and run a small cheap test in the new territory before committing, like one week of cards versus one week of problem sets, scored on actual problem-solving. What changes is that you extend wins deliberately instead of by assumption. Skip the boundary check when the new context matches the old one in every way that plausibly matters.