MMP.19:1 - Problem frame

Use this pattern when the question concerns the same case under another action, a joint comparison of its possible responses, or a specified pathway through which a change would act. A population average may be available while the case-specific or pathway question remains unanswered.

Start with the intended use, the observations about the case or population, and a causal account of the relevant mechanisms. Construct what remains common across the alternatives, carry factual information into that construction and calculate the consequence or range it supports. A useful first result can be two compatible models that give different answers: the supplied information then leaves this distinction unresolved.

The mathematical prerequisites are function evaluation and the probability operations used in the chosen construction. A qualified contributor can supply them. The meaning of the variables, observations and interventions still needs subject knowledge. Small finite cases can be calculated by hand.

For a population intervention effect, use MMP.15 and C.28.MR directly. A choice maximizing expected realized outcome under each action can also need only those intervention distributions, conditional on the information available before acting. Constructing a joint counterfactual law is useful when the receiving question actually depends on it.