ME.11:1 - Problem Frame
Method trials are often easiest to describe after the fact: a team used some material, produced a result, and reported value. That compression hides what Method was admitted, which Work occurred, who performed it, which support conditions were present, what changed, and which conclusions the observations can support.
Convenient success cases also miss the situations that matter most. A Method may look usable in a familiar task and fail when feedback is closed-loop, information is incomplete, capability is stale, or a required relation is absent. Representative and discriminating situations therefore serve different purposes and must be selected for an explicit later question.