ITM 430 Lecture Notes - Lecture 2: Special Education In The United Kingdom, Use Case, Usability

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 430
• Professor: Junlian Xiang

Document Summary

Use case: a text story of some actor using a system to meet goals. Actor: is anything with behavior that triggers use case execution. Primary actor accomplishes goals via use case: example: the cashier. Secondary actor provides a service to use case (often a computer system, but could be an organization: example: the automated payment authorization service. Offstage actor is interested in use case results: example: government tax agency. Three possible use case formats: brief format: one paragraph summary usually of the main success scenario. Process sale: a customer arrives at a checkout with items to purchase. The cashier uses the pos system to record each purchased item. The system presents a running total and a line-item details. The customer enters payment information, which the system validates and records. The customer receives receipt from the system and then leaves with the items. casual format: multiple paragraphs that cover various scenarios. Fully dressed: all steps and variations are written in detail.