Use Case Diagram



Definition

A use case diagram is a mid-level requirement diagram that documents the relationships between use cases and the externals with which they interface.

Objectives

The typical objectives of a use case diagram is to:

Benefits

The typical benefits of a use case diagram are to:

Contents

The typical contents of a use case diagram are:

Stakeholders

The typical stakeholders of a use case diagram are:

Phases

Preconditions

Use case diagrams can typially be started if the following preconditions hold:

Inputs

The typical inputs to a use case diagram include:

Guidelines

Conventions

Use case diagrams are typically constrained by the following conventions:

Examples

Electronic Auction System Use Case Diagram

The following system use case diagram documents the use cases performed by the Buyer actor of an electronic auction system.

Figure of Electronic Auction System Buyer Use Case Diagram