DTM.9:4 - Solution
Model how the response is generated and sustained, how it acts on each relevant activity, and how those effects return to the conditions that generate it.
DTM.9:4.1 - Identify the response and its information
Use DTM.8 to name the protected function and target. Recover what generates the response: an observed event, accumulated evidence, a prediction, a standing rule or a participant’s judgement. Distinguish the actual condition from the signal used to recognize it.
Specify the operation that follows and the means needed to perform it. C.30.LCA supplies the relevant control relations; the technical or organizational practice supplies the detection and action method.
If recognition is uncertain, retain its consequential errors. An action that perfectly distinguishes useful and faulty variants is not available merely because the model assigns them different symbols.
DTM.9:4.2 - Choose the response state and time description
Represent formation, decay, persistence and capacity limits at the resolution needed by the question. A response may depend on current activity, past experience or prediction. Use a state or history sufficient to represent that dependence.
An algebraic response a=F(x,u) assumes that its adjustment is sufficiently fast for the receiving result, where x describes relevant activity and u the proposed change. A simple dynamic alternative is:
τa' = F(x,u) − a, with τ > 0.
This illustrative first-order adjustment does not automatically represent learning, saturation or several kinds of memory. Introduce those relations only where supported. MMP.11/.18 govern the state choice and any reduction.
Test the simplification against the decision. A stationary comparison can tolerate a reduction that would be unsuitable for startup, short disturbances or a deadline. Even a fast response can matter when a brief transient crosses an irreversible boundary.
DTM.9:4.3 - Follow effects on useful work, unwanted activity and transmission
For every variant that can change the conclusion, recover how the response changes execution, continuation or uptake. Use the different sensitivities or action conditions supplied by the subject account.
Then follow indirect effects through the relations identified in DTM.6: released capacity, lost prerequisite capability, changed compatibility or a changed audience. Connect resulting participant states to transmission with DTM.3.
Do not add a common resource or a biological mechanism merely to complete a familiar model. A compatibility restriction may operate through exchange opportunities alone; a checking process may instead share scarce staff time with the work it checks.
DTM.9:4.4 - Account for response costs and restoration
Name each material consequence and its recipient. Direct effort, delayed useful work, inappropriate restrictions and external harm need not share a unit or a scalar total. A.6.P.RI and the existing evaluation methods retain those distinctions.
If a local consequence accumulates and can be repaired, represent both its source and restoration. DTM.8 distinguishes changing the source from repairing its result. State which other participants’ consequences remain outside that local measure.
At the method vertical, verify that sensing, decision, action and restoration can operate together while supporting the containing work. A proposed response that consumes the only capacity needed for that work may be infeasible even if its isolated mechanism succeeds.
DTM.9:4.5 - Compare regimes, transients and changed variants
Compare the unchanged arrangement with the feasible response changes. Use DTM.4 for persistence and return, and the appropriate mathematical and computational methods for the calculation.
Where variants can change, examine a consequential alternative that differs in response sensitivity or continuation mechanism. Separate a possible variant from evidence that it will arise. DTM.2 supplies reconstruction or change; DTM.5/.6 explain differential continuation. Reuse the existing improvement and model-revision methods rather than adding an automatic escalation rule.
Return the condition under which the response helps, its adverse effects, sensitivity to uncertain relations and the observation that would change the choice. “Protection works” is too broad when the result holds only for one variant or one recipient.