401 Chapter 5 - Modeling System Requirements

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use case

an activity the system performs

user goal technique

an approach for identifying use cases in which an analyst talks to all users to get them to describe their goals in using the system

CRUD technique

an approach in which an analyst looks at each type of data and includes use cases that create the data, read or report on the data, update the data, and delete the data

elementary business process

a task that is performed by one person, in one place, in response to a business event; it adds measurable business value and leaves the system and its data in a consistent state

event

an occurrence at a specific time and place that can be described and is worth remembering

event decomposition

an analysis technique that focuses on identifying the events to which a system must respond and then determining how the system must respond

external event

an event that occurs outside the system, usually initiated by an external agent or actor

temporal event

an event that occurs as a result of reaching a point in time

state event

an event that occurs when something happens inside the system that triggers the need for processing

system controls

checks or safety procedures put in place to protect the integrity of the system

perfect technology assumption

the assumption that events should be included during analysis only if the system would be required to respond under perfect conditions

event table

a catalog of use cases that lists events in rows and key pieces of information about each event in columns

trigger

a signal that tells the system that an event has occurred, either the arrival of data needing processing or a point in time

source

an external agent or actor that supplies data to the system

response

an output, produced by the system, that goes to a destination

destination

an external agent or actor that receives data from the system

use case description

lists the processing details for a use case

actor

in UML diagrams, a person who uses the system

scenario or use case instance

a unique set of internal activities within a use case that represents a unique path through the use case

preconditions

conditions that must be true before a use case begins

postconditions

conditions that must be true upon completion of the use case

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