Exhibit A continued

System Requirements

—The system must have an overall end-user response time of five seconds.

—The system must be able to accommodate up to fifteen concurrent users at three geographic locations.

—The database must be able to store summary defect information for up to 1M defects.

—The model base must be able to support up to 1500 models.

—The system availability must be greater than 90%.

• Maintainability:

—Preventive maintenance must be scheduled during weekday off-hours and weekends.

pairwise comparisons. The results in terms of overall scores for the three alternatives were as follows:

Alternative 1: Score = 0.361

Alternative 2: Score = 0.334

Alternative 3: Score = 0.305

An illustrative risk analysis was carried out for SD-DSS with the results as shown in Exhibit A.4. Note that risks were considered in the categories of overall funding, cost, schedule, administrative, and technical.

System enhancements were analyzed under the systems engineering element of preplanned product improvement (P3I), with the following results:

• Enhance SD-DSS with a knowledge acquisition system (i.e., an expert system) consisting of:

—A knowledge base —An inference engine —A blackboard (workboard) —A user interface

• Enhance SD-DSS with an expert critiquing subsystem consisting of: —An executive

—An evaluator —A transformer —An elicitor

Exhibit A.3: SD-DSS Alternatives

Alternative 1

Classical Time-Sharing Monolithic Architecture

—Centralization of all three functional areas onto monolithic platform —Functional management areas designed various COTS application packages and customization

—Data management: DB2 with Query Management Facility —Model management: Application System, Lotus/M —Dialog management: Data Interpretation System

—Partitioned IBM mainframe or dedicated AS400 series machine —Graphics terminals

Alternative 2

Local Area Network (LAN)-Based Workstation System Architecture

• Personal workstations connected to a minicomputer in client-server arrangement:

—Workstations handle the interface, high-speed graphics display devices, and some of the data-reduction function —File server handles the data management and the bulk of the analysis

—Functional management areas designed with various COTS application packages and customization —Data management: Oracle —Model management: Criterium, Oracle, Lotus/M —Dialog management: Sun Solaris 2.0 —UNIX OS and Novelle UNIXware NOS

—Sun SPARCserver 10 File/Application Server —Sun SPARCstation Workstation

Alternative 3

LAN-Based PC Network with File Server Architecture

• Total PC solution where information from the corporate database is downloaded to the PC LAN environment and then delivered to the PCs

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