HCD.18:4.2 - Derive the tasks and contrast cases outside the present table of contents

Start from the work the audience should be able to perform or practise. Recover its required distinctions, prerequisite operations, acceptable variants, and consequential errors from the problem and a qualified subject basis. A material’s claim of coverage does not define its own denominator.

For each promised task, ask what a successful contribution would contain and which plausible wrong contribution an apparently adequate explanation might also produce. Choose a case on which the alternatives differ. In the time example, an uninterrupted interval cannot distinguish active effort from elapsed turnaround; an interruption can.

Compare this task-derived need with the actual explanations, examples, practice, and accessible returns. A precise external return can supply a contribution if it is usable by this audience at this point. A title that promises the contribution cannot.

Prepare three kinds of contrast:

• an in-scope material that supplies the needed contribution;
• an in-scope material with a consequential deficiency;
• a nearby object or use for which this specification would answer the wrong question.

These contrasts test fit as well as quality. A personal capability judgement is outside a material specification even when the same learner task appears in both.

Distinguish the subject basis from manufacturing history. An existing directly authored book can be evaluated without knowing how its author wrote it. If fidelity to a transcript, prescribed edition, or earlier rendering was promised, evaluate that source-to-material relation on its own evidence.