HCD.19:1 - Problem Frame

An editor receives two apparently conflicting results. A prepared reader solves an interrupted-task exercise correctly, while the handout defines task effort as start-to-handoff time. The reader explains that the active/elapsed distinction came from prior knowledge. After a teacher question and a corrected explanation, the answer remains correct.

The editor has obtained useful evidence, but not the initially expected learning gain. The original material still supplies the wrong relation; the repaired material now supplies a better one; the unchanged answer cannot show that the reader learned it. A changed two-person case can check whether the repair supports the intended population denominator without treating its success as delayed retention.

A different difficulty arises in a long course. A reader may understand each local definition but fail to connect an early distinction to a later choice. Evaluating isolated excerpts will miss that edge. Conversely, a wrong figure return can be repaired locally while a reported broader difficulty remains unresolved.

This pattern connects the task, actual response, material evidence, and repair. It helps an evaluator identify the smallest complete change without confusing a person, material, teacher service, and evaluation instrument.