PHY.2:4.4 - Recover preparation, interpretation and available range

Describe how the relevant source state starts and how it is driven. The initial deformation of a target spring, for example, can require stored current in an electrical source. Setting every source state to zero would solve a different initial-value problem. Likewise, the preparation of a distribution includes more than its mean when its later behavior depends on that distribution.

Connect each source quantity used in the result to what it represents about the target. Include units and scales: source voltage may represent target velocity through a dimensional conversion, and source time may run faster. Derive that correspondence by substituting the conversion into the laws and preparation. C.29.1 provides the general argument that a source result transfers to the intended mathematical target.

When proposing a material realization, determine whether its components can supply the required signs, ranges and rates together. Include the effect of observing or driving the source if it changes the relevant behavior. A nominally passive observation can load an electrical node; a finite switching time can matter when the requested event is short. C.29.3 supplies the preparation, action and readout relation for physical computation.

For a thought construction, state the physical idealizations on which its consequence depends. That conditional result can already direct a useful change or inquiry. Building an apparatus is a further choice, selected when its outcome would add a worthwhile contribution through C.11.DUA.