Target/codes: independently distinguish reversal from equal-count changed order; partial AC9AMUFD01. Prepare: held public Back 1/exact neutral access/key closed.
- Welcome · 3 min. “Which BACK uses the last bit first?” Neutral AAC/sign/word/direct-adult marks/rest/pass; integrated Day 195 separate.
- Access · 4 min. Read full new FIRST/P/Q sound/wait choices and public rule neutrally, local/shared positions. No matched sound/answer/classification/match hint.
- Independent plan · 5 min. Child chooses exact reversed BACK and traces all five corresponding decisions. Preserve first answer before support; no performance requirement.
- Child response · 7 min. Ask differences in other BACK, what counts/places hold and what score cannot prove. Child directs words/marks rather than required speech/touch.
- Self-check · 4 min. Independent recheck all five, record first/self-revision/support. Unfinished at the time limit = not yet observed; offer another short sitting, no completion-speed score. Pass/unavailable access unobserved, another opportunity arranged.
- Close · 2 min. Private teacher key afterward; today's After Check practice/bridges not replacement first evidence.