HCD.5:5 - Archetypal Grounding

HCD.5:5.1 - Correct Calculation, Unsupported Cause

In a constructed pump case, flow remains 100 m³/h while measured power rises from 20 to 22.4 kW, so the calculated energy per unit volume rises by 12%. The person computes the ratio correctly but concludes that the controller change caused the increase. Current facts leave at least resistance, regulation efficiency, and measurement error as live explanations.

The target is not unit conversion or arithmetic. It is proposing competing explanations, stating a discriminating observation, and keeping the conclusion conditional. A selected Method set uses one worked explanation that makes the rival predictions visible, a coached discrimination attempt, and a later changed case in which the person must choose the next observation without the Method or answer supplied. Focused unit practice remains a surviving candidate only if a separate starting observation shows a unit error. Generic repetition of the original calculation is rejected because it does not address the target.

The selection account records the proposed reasoning mechanism, teacher feedback needed, safe stipulated data, changed-condition observation, and the limit that this exercise does not establish engineering capability or the causal effect of the Method.

HCD.5:5.2 - Execution with a Cue, Failure to Select

A person can apply a finite comparison correctly whenever C.11.CRC is named, yet chooses a local score when a new situation requires comparing complete configurations. More worked examples with the PatternID printed beside the task would rehearse execution while preserving the selection failure.

HCD.5 selects discrimination practice across cases in which a finite comparison, a sensitivity result, or a source check is appropriate. Early feedback names the decision-bearing cue; later tasks remove the answer-bearing Method label and change the configuration or horizon. The intended observation is correct recognition and selection before execution on the changed case. It can support this performance claim without yet establishing whether the practice caused the change. HCD.6 supplies the actual representative task set; HCD.9 records what happened in each attempt.

HCD.5:5.3 - Missing Project Access Is Not a Practice Dose

A participant can explain the target Method on a supplied case but cannot apply it in their work because the project data and permission for a small safe trial are absent. The missing access changes the next action before any learning-technique comparison. HCD.5 returns the exact data, permission, owner, blocked practice decision, and retry condition to HCD.7 or the direct project owner. It preserves any supported human target but does not prescribe a longer course or call non-participation low motivation.

HCD.5:5.4 - Future Audience Design Hypothesis

A learning-product author expects entrants to differ in unit work, causal discrimination, and Method recognition. HCD.5 may propose conditional branches: focused component preparation for an observed unit error, worked explanation and coached discrimination for an unsupported cause, and Method-selection practice for cue dependence. The author still needs entry tasks that distinguish those conditions. The branch is not a frequency claim about engineers or a prescription for any person not yet observed.