Library / Music and Dance Practice Engineering Principles Framework
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Source changed 2026-10-03 11:52:20 UTC · snapshot created 2026-10-03 11:53:41 UTC · last check 2026-10-03 12:10:10 UTC

Change quality and relationships, not only positions

Once material exists, select what must remain identifiable while it changes. The same phrase can retain its order and temporal landmarks while varying attack, continuity or scale. Marking can preserve chosen spatial and temporal organization at reduced execution demand; it is not specified by halving physical joules. When a reduced version omits something needed by the later performance, restore and test that contribution before relying on it. HCD.6 constructs the practice task, HCD.9 uses the response, and HCD.12 tests the relevant later use. Marking may also be the final artistic choice rather than a temporary rehearsal aid.

For a group, construct the relationships that make the whole possible. Ask where another person’s location, response or support is required, which cues make that requirement available, and what happens while someone waits. Equal durations do not establish compatible paths or support. Repeating a velocity score does not guarantee return to the same place: moving forward at v for one second and backward at v for three seconds yields a −2v s displacement per cycle. Change the score or available space when that drift conflicts with the composition; do not hide a reset between cycles. RHY supplies the temporal relationship and MDPE.3 the coordinated performing whole. Any actual shared weight or contact requires its own competent technique and suitable conditions.

Constructed response duet. Two seated performers have separate, non-overlapping comfortable hand areas and no bodily contact. They already know a small four-second hand motif that starts and ends at home. They select two available qualities, one continuous and one interrupted, without changing its four-second duration. The artistic question is whether a contrast can read as one participant answering another.

In each eight-second exchange, A performs one chosen quality during seconds 0–4; B watches, then performs the other quality during seconds 4–8 while A rests. A may choose either quality at the beginning of each exchange. After three exchanges, both return to home and end. The prepared rule fixes turn order, duration, the contrasting response and ending; the choice of A’s quality remains live. This is a twenty-four-second responsive score, unlike the fixed duet below.

First compare it with a same-quality response under the same timing and seating. Ask observers what relation they noticed and where it became apparent; do not announce the intended contrast before collecting that account. Ask performers separately whether the cue was recognizable in time and whether the response was available. MDPE.9 can retain the contrasting version for the brief while recording an unclear audience effect or an unavailable response as different findings.

Suppose B recognizes the quality only after the fourth second and consistently enters late. More forceful execution does not directly solve that timing problem. One option adds an agreed visible cue early in A’s motif; another adds a two-second observation interval, producing ten-second exchanges and a thirty-second whole. Compare what each changes: the early cue may make the exchange conspicuously signaled, whereas the gap may weaken immediacy but permit the response. If twenty-four seconds is a firm requirement, the second option is unavailable without changing the brief. RHY.10 helps establish usable shared landmarks; HCD.6.1 addresses recognition if B cannot distinguish the qualities even without time pressure. When recognition is adequate but performance fails, return to HCD/SOM practice or select another available response. Do not silently replace the live choice with a memorized sequence and keep claiming that the same response capability was demonstrated.