Final answer:
A use case is associated with the Analysis phase of system development, where it is used to describe interactions and the sequences of events for specific system functions.
Step-by-step explanation:
A use case represents the steps in a specific business function or process and is typically associated with the Analysis phase of system development.
During the Analysis phase, stakeholders and analysts work to gather requirements and define the functionality of the system to meet those requirements.
Use cases are created to describe the interactions between users (or "actors") and the system, detailing the sequence of events that occur to perform a particular function. The Analysis phase is critical as it helps ensure that the system design will meet the identified needs of the business or organization.