HCD.20:4.2 - Derive different scales from the actual activity

Separate admission, immediate task groups, continuing relationships and provider assignment. Work from the action that needs capacity.

For sequential contributions, use an explicit time construction. If each of k participants needs r contributions of t minutes, and joint coordination needs c(k) minutes, the proposed activity requires at least k × r × t + c(k) within its window T. Include preparation or transitions elsewhere when they lie outside that window; include them here when they consume it. The inequality is a necessary capacity bound on the stated sequence, not a sufficient scheduling test or a law of ideal group size. A help visit also requires the learner and provider to be free together and the relevant inputs to be ready.

For a shared instrument, identify which actions require exclusive control and which can occur while someone else operates. Schedule the necessary personal turns and meaningful observer actions. For parallel annotation or drafting, inspect the later reading, comparison and integration burden: simultaneous writing does not make integration instantaneous.

Choose the smallest configuration that supplies the needed contributions without destroying the task’s purpose, then compare a serious alternative where a different configuration could improve the result or burden. A larger group may add a useful counterexample, and a smaller group may omit it. “Smallest” is conditional on contribution, not a universal objective.

An observation role must name an action: predict, measure, detect a violated condition, ask for a discriminating test or explain a change. Merely watching or recording attendance does not establish that action. If personal instrument manipulation is part of the target, observation does not eliminate the necessary later hands-on attempt.