DTM.6:1 - Problem frame

Use this when a method spreads, persists or works differently in the presence of another variant, and treating the two independently would change the decision.

Two procedures may draw on the same limited capacity. One practice may teach a notation needed by another. A shared response to both may restrict them unequally. These are different mechanisms; identifying the connection comes before choosing an equation.

The first useful result is a dependence of one variant’s execution, continuation or transmission on the other, through a named relation that can be investigated. The result includes the independent-action comparison and an observation that could distinguish the explanations.

If the question concerns only two interacting components, with no continuation or transmission of variants, ordinary subject modeling is sufficient.