HCD.10:4.2 - Select the Smallest Change that Can Answer the Question
Use this discrimination table:
| Question about the next practice | Candidate change | Required statement |
|---|---|---|
| Does the learner change the action when a deciding condition changes? | variation | Which condition changes, which action should be preserved or changed, and which rival response is exposed? |
| Can the learner perform another episode after a material interval? | spacing | Which repeated episode, separated times, interval rationale, intervening activity, and later observation are used? |
| Must a contribution be recovered without reopening a source? | retrieval | What is retrieved, what remains supplied, why unaided recovery matters, and what support is still allowed? |
| Must the learner distinguish which Method or case family applies? | interleaving | Which alternatives are mixed, which similarities cause confusion, and what selection explanation is required? |
| Is stable performance ready for a changed level of challenge or help? | progression | Which feature changes, what prior evidence supports the change, and what condition pauses or reverses it? |
Select several changes in one episode only when their contributions and failure interpretations remain recoverable. Otherwise change one decision-bearing feature at a time or create comparable branches.