soft eng midterm

Use Case Description

A textual model that lists and describes the processing details for a use case

Brief Use Case Description

A short description that gives enough detail for very simple use cases or small applications

Fully Developed Use Case Description

The most formal method for documenting a use case, increasing the probability of understanding business processes and system support

Preconditions

Identify the state of the system required for a use case to begin, including existing objects and available information

Postconditions

Identify what must be true upon completion of a use case, indicating new or updated objects and their associations

Activity Diagram

A diagram used to document or supplement the flow of activities for a use case

System Sequence Diagram (SSD)

A model showing the sequence of messages between an actor and the automated part of the system during a use case

Lifeline / Object Lifeline

A vertical dashed line underneath an actor or object representing its extension/duration during a use case

Loop Frame

A notation on a sequence diagram showing repeating messages

Opt Frame

A sequence diagram frame used when a message or series of messages is optional based on a true/false condition

Alt Frame

A sequence diagram frame used to depict if-then-else processing logic

User Story

A short description of what an end-user does, formatted as "As a , I want to so that "

Acceptance Criteria

Features that must be present in a user story implementation for the user to be satisfied

Use Case

An activity the system performs in response to a request by a user

User Goal Technique

A technique to identify use cases by determining what specific goals or objectives users must complete using the system

Event Decomposition Technique

A technique to identify use cases by determining the business events to which the system must respond

External Event

An event occurring outside the system, usually initiated by an external agent or actor

Temporal Event

An event that occurs automatically as a result of reaching a specific point in time or deadline

State Event

An event occurring when an internal system state change triggers processing

External Agent

A person or organizational unit outside the system that supplies or receives data

Perfect Technology Assumption

The assumption that events are included during analysis only if required under ideal conditions without technical failures or human error

Use Case Diagram

A UML model used to illustrate use cases and their relationships to actors

Automation Boundary

The boundary separating the computerized portion of an application from the users operating it

Actor

A stick figure representation in UML denoting a person or role interacting with the system