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Logical Model

Any model that shows what the system is required to do without committing to any one technology.

Physical Model

Any model that shows how the system will actually be implemented.

System Requirements

Specifications that define the functions to be provided by a system.

Functional Requirement

A system requirement that describes an activity or process that the system must perform.

Nonfunctional requirement

Characteristics of the system other than activities it must perform or support, such as technology, performance, usability, reliability and security. - doesn't mean that it is not working, it means that it is not something the system does.

Technical Requirement

A system requirement that describes an operational characteristic related to an organization's environment, hardware, and software.

Performance Requirement

A system requirement that describes an operational characteristic related to workload measures, such as throughput and response time.

Usability Requirement

A system requirement that describes an operational characteristic related to users, such as the user interface, work procedures, online help, and documentation.

Reliability Requirement

A system requirement that describes the dependability of a system, such as how it handles service outages, incorrect processing, and error detection and recovery.

Security Requirement

A system requirement that describes user access to certain functions and the conditions under which access is granted.

Mathematical Model

A series of formulas that describe technical aspects of a system.

Descriptive Model

Narrative memos, reports, or lists that describe some aspect of a system.

Graphical Model

Diagrams and schematic representations of some aspect of a system.


All the people who have an interest in the success of a new system.


A single occurrence of a piece of work or an activity done in an organization.


A sequence of steps to process a business transaction.

Activity Diagram

A type of workflow diagram that describes the user activities and their sequential flow.

Synchronization Bar

A symbol in an activity diagram to control the splitting or uniting of sequential paths.


A rectangular area on an activity diagram representing the activities of a single agent.


A preliminary working model of a larger system.


An example of a final product that is for viewing only and is not executable.

Closed-ended Questions

Questions that have a simple, definitive answer.

Open-ended Questions

Questions that require discussion and do not necessarily have a simple, short answer.

Joint Application Design (JAD)

A technique to define requirements or design a system in a single session by having all necessary people participate.

Group Support System (GSS)

A computer system that enables multiple people to participate with comments at the same time, each from their own computer.

Structured Walkthrough

A review of the findings from your investigation and of the models built based on those findings.

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