D

Data

Recorded information, regardless of medium or characteristics, of any nature, including administrative, managerial, financial, and technical.

Data product

Information that is inherently generated as the result of work tasks cited in a Statement of Work [SOW] or in a source document invoked in the contract. Such information is produced as a separate entity [for example, drawing, specification, manual, report, records, and parts list].

Database

A collection of related data stored in one or more computerized files in a manner that can be accessed by users or computer programs via a database management system.

Database management system

An integrated set of computer programs that provide the capabilities needed to establish, modify, make available, and maintain the integrity of a database.

DATEX

Data Exchange

DBMS

Database Management System

DDR

Detail Design Review

Decomposition

The process of successively breaking down the system into components that can be built or procured. Functional and physical decomposition are the key activities that are used. Functional decomposition is breaking a function down into its smallest parts. For example, the function ramp metering decomposes into a number of sub-functions, e.g. detection, meter rate control, main line metering, ramp queuing, time of day, and communications. Physical decomposition defines the physical elements needed to carry out the function. For example, the ramp metering physical decomposition includes loops or video detection, WWV time [world wide standard clock for accurate time], fiber or twisted pair for communications, 2070 or 170 controllers, and host computer.

Design

Those characteristics of a system or components that are selected by the developer in response to the requirements.

Detailed Design Document

The product baseline used to develop the hardware and software components of the system.

Developer

An organization that develops products ["develops" may include new development, modification, reuse, reengineering, maintenance, or any other activity that results in products] for itself or another organization.

Development model

A specific portion of the life cycle model that relates to the definition, decomposition, development, and implementation of a system or a part of a system.

Development strategy

The way the development and deployment of the overall system will be carried out. For example, an evolutionary development strategy means that the system will be developed and deployed in multiple segments over time. These pieces are complete functional units that will perform independently from other functional pieces. Incremental development is the development of pieces that are done concurrently or nearly concurrently by the same or different development teams.

DOT

Department of Transportation