The Jam Essay

Use Cases for Version 1.0 approved
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Guidance for Use Case Template
Document each use case using the template shown in the Appendix. This section provides a description of each section in the use case template.
1. Use Case Identification
1.1. Use Case ID
Give each use case a unique numeric identifier, in hierarchical form: X.Y. Related use cases can be grouped in the hierarchy. Functional requirements can be traced back to a labeled use case.
1.2. Use Case Name
State a concise, results-oriented name for the use case. These reflect the tasks the user needs to be able to accomplish using the system. Include an action verb and a noun. Some examples:
View part number information.
Manually mark hypertext source and establish link to target.
Place an order for a CD with the updated software version.
1.3. Use Case History
1.3.1 Created By
Supply the name of the person who initially documented this use case.
1.3.2 Date Created
Enter the date on which the use case was initially documented.
1.3.3 Last Updated By
Supply the name of the person who performed the most recent update to the use case description.
1.3.4 Date Last Updated
Enter the date on which the use case was most recently updated.
2. Use Case Definition
2.1. Actor
An actor is a person or other entity external to the software system being specified who interacts with the system and performs use cases to accomplish tasks. Different actors often correspond to different user classes, or roles, identified from the customer community that will use the product. Name the actor(s) that will be performing this use case.
2.2. Description
Provide a brief description of the reason for and outcome of this use case, or a high-level description of the sequence of actions and the outcome of executing the use case.
2.3. Preconditions
List any activities that must take place, or any conditions that must be true, before the use case can be started. Number each precondition. Examples:
1. User’s identity has been authenticated.
2. User’s computer has sufficient free memory available to launch task.
2.4. Postconditions
Describe the state of the system at the conclusion of the use case execution. Number each postcondition. Examples:
1. Document contains only valid SGML tags.
2. Price of item in database has been updated with new value.
2.5. Priority
Indicate the relative priority of implementing the functionality required to allow this use case to be executed. The priority scheme used must be the same as that used in the software requirements specification.
2.6. Frequency of Use
Estimate the number of times this use case will be performed by the actors per some appropriate unit of time.
2.7. Normal Course of Events
Provide a detailed description of the user actions and system responses that will take place during execution of the use case under normal, expected conditions. This dialog sequence will ultimately lead to accomplishing the goal stated in the use case name and description. This description may be written as an answer to the hypothetical question, “How do I ?” This is best done as a numbered list of actions performed by the actor, alternating with responses provided by the system.
2.8. Alternative Courses
Document other, legitimate usage scenarios that can take place within this use case separately in this section. State the alternative course, and describe any

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