Storyboarding is a visual technique used in software requirements engineering to help understand user needs and system functionality. It involves creating a series of illustrations that show how a user will interact with a proposed system. Storyboards have benefits like communicating design ideas clearly and allowing feedback before development. Prototyping creates a mock-up of a proposed system to help validate requirements with users. Use cases are written descriptions of how users will perform tasks with a system. They define the actors, scenarios, and goals to help specify requirements.

13. Prototyping Process Establish Prototyping Objectives Define Prototyping Functionality Develop Prototype Evaluate Prototype Prototyping Plan Outline Definition Executable Prototype Evaluation Report

21. Use-Case Diagram