R

RAID

Redundant Array of Independent Devices, refers to a storage device with multiple hard drives that have data stored in a manner that insures that if one drive fails, that the drive can be replaced and the system will recreate automatically all of the data that was lost from the malfunctioning hard drive.

Rapid Application Development (RAD)

RAD is part of a methodology that specifies incremental development with constant feedback from the customers. The point is to keep projects focused on delivering value and to keep clear and open lines of communication. Oral and written communication is not completely adequate for specification of computer systems. RAD overcomes the limitations of language by minimizing the time between concept and implementation.

Rational Decision Behavior

Rational decision behavior is goal-oriented in reaching a decision. Behavior is guided by the consequences likely to result from the selection of a given alternative. A decision maker believes based upon analysis that a chosen alternative will result in achieving one or more desired objectives. Rational decision behavior can be supported by Decision Support Systems.

Record

A group of data values consisting of one value for each of a prescribed set of relational fields; an occurrence of a record type.

Report and Query Tools

These tools produce a tabular list of information from data stored in a relational database. Examples include Microsoft Access and Brio Query. See Ad-Hoc Query Tool

Representation

The formulation or view of a problem. Developed so the problem will be easier to solve.

Result Variables

In a Model-Driven DSS a result variable shows the consequences of changing decision variables. Result variable are also referred to as dependent variables.

ROMC (Representation, Operations, Memory Aids, Mechanism Control) Design Approach

A systematic approach for developing large-scale DSS, especially user interfaces. It is user-oriented approach for stating system performance requirements (cf., Sprague and Carlson, 1982).

Rule

A rule is a formal way of specifying a recommendation, directive, or strategy, expressed as IF premise THEN conclusion. Rules are the primary building blocks of Knowledge-Driven DSS and Expert Systems.