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Maintainability

The ease with which a software system (or system component) can be modified to correct faults, improve performance or other attributes, or adapt to a changed environment.

Maintenance

In software engineering, the activities required to keep a software system operational after implementation. See adaptive maintenance, corrective maintenance, enhancement, perfective maintenance.

Maintenance Manual

A formal document that provides systems maintenance personnel with the information necessary to maintain the system effectively.

Maintenance Review

A formal review of both the completed and pending changes to a system with respect to the benefits achieved by completing the recommended changes; also provides information about the amount of maintenance required based on activity to date.

Measurement

In project management, the process of collecting, analyzing, and reporting metrics data.

Methodology

A set of methods, procedures, and standards that define the approach for completing a system development or maintenance project.

Metrics

A quantitative measure of the degree to which a system, component, or process possesses a given attribute.

Migration

Porting a system, subsystem, or system component to a different hardware platform.

Milestone

In project management, a scheduled event that is used to measure progress against a project schedule and budget.

Mission

The goals or objectives of an organization or activity.

Model

A simplified representation or abstraction (e.g., of a process, activity, or system) intended to explain its behavior.

Module

In system design, a software unit that is a logically separate part of the entire program. See unit.

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