MDPE.20:3.4 - Construct trajectories from different mechanism families

Build a small set of serious, materially different trajectories. Use only mechanism families relevant to the case. These can include:

• perceptual or reconstructive: listeners, dancers, teachers, or imitators systematically transform material toward familiar or easier structures;
• motor, bodily, instrumental, or robotic: coordination, effort, morphology, control, latency, or instrument constraints make some variants easier to perform and reproduce;
• contextual retrieval and interference: cues, partners, music, venues, body state, or transition history change which learned repertoire is expressed;
• capability development: teaching, rehearsal, feedback, context variation, and transfer change who can enact or recognize the variants;
• motivation and interest: some challenges, surprises, identities, affiliations, or rewards attract attention and repeated practice under a named population and use;
• material and ecological: floors, venues, instruments, media, tools, schedules, cost, access, and safety change feasible Work;
• mediation and network: teachers, peers, events, recordings, platforms, recommendation, and network topology change exposure and reconstruction chains;
• recognition and selection: partners, audiences, judges, curators, schools, organizers, and communities amplify or reject different features;
• transmission, retention, and loss: variants reproduce with transformation, remain locally available, split across populations, or cease to be enacted; and
• drift, branching, or no stable attractor: change has no stable basin under the selected horizon, or several branches remain viable.

Keep serious rivals whose differences matter to the forecast or its receiving use. The same preparation can be warranted across remaining trajectories; do not invent an action-changing rival merely to force another probe.

For each trajectory, state the mechanism claim, conditions, expected direction or distribution, uncertainty, and observations that would be surprising under it. Use A.3.3 only when an actual state-space and transition-law claim is made. Use C.28 only when the decision relies on a causal contribution.