Executive function support usually works. That is not the problem.
The problem is that the support is external. The adult supplies the plan, the timer, the prompt. The student performs. The adult leaves. Performance collapses.
Everyone then concludes the strategy failed. It did not. Nobody designed the handover.
The fix is a single question asked at the wrong time on purpose: at the moment you introduce any support, before you use it once, describe what the next three reduced versions look like. Full verbal prompt, then visual prompt, then a checklist the student wrote themselves, then independent initiation. This simple approach is one of the most effective executive function strategies for students because it builds independence from the very beginning.
If you cannot describe the next reduced version, you have built a dependency rather than a skill, and you have built it deliberately without noticing.
Sarah Ward's course on independent executive function skills treats the fade as the central design problem rather than as something that happens naturally once a student is ready. It does not happen naturally. It has to be scheduled.