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Use cases capture how an actor achieves a goal with the system through a main success path and alternate/exception flows, framed by preconditions and postconditions. They are ideal when you need structured, testable narratives that clarify scope boundaries without prescribing UI. User stories (A) are concise placeholders for conversation and acceptance criteria; they rarely convey end-to-end flow by themselves. Story mapping (C) visualizes the user journey and helps slice releases but is higher level. Wireframes (D) focus on interface layout, not underlying interaction logic. CAPM-aligned analysis stresses selecting the artifact that reduces the most ambiguity for the audience. Well-formed use cases complement a data dictionary and sequence diagrams: together they define behavior, terminology, and message timing. They also feed the Requirements Traceability Matrix and test design (deriving cases for each alternate/exception flow). Keeping use cases technology-agnostic enables flexibility during design while preserving verifiable outcomes for validation and acceptance.