CAD.5:10 - Rationale

Information matters through distinctions the next action must respect. A measurement can refine an old state while leaving recent disturbances unresolved. Applied-input history makes predictable change available to the controller; it does not create missing information about unpredictable change.

The method therefore joins three constructions: compatible state histories, a sufficient internal update, and a common action with a qualified continuation. The two-channel example works because the rapid channel restricts a direction whose uncertainty grows too quickly, while the delayed complete channel is sufficient for the slower direction. The simpler changed-task case works because an unobserved direction remains bounded without intervention.

This separates two ideas often discussed together. Diversity-enabled sweet spots (DeSS) concern a favorable whole arrangement of components with different limitations under a specified task and resource model. Internal feedback pathways (IFP) concern reuse of internal action, prediction or state information in a controller’s realization. One does not prove the other; the information and control calculations must establish their particular connection.