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Computer Essentials Chapter 13
Computer Science Final
Terms in this set (29)
Collection of activities and elements designed to accomplish a goal.
Systems Analysis and Design
Six phases of problem solving procedures for examining information systems and improving them.
Systems Life Cycle
The six phases of systems analysis and design are called the systems life cycle.
First Phase; It involves defining the problem, suggesting alternative systems, and preparing a short report.
Second Phase; studying present system and speciyfing new requirements
Third Phase; designing alternative systems, selecting the best system, and writing a systems design report.
Fourth Phase; developing software, acquiring hardware, and testing the new system.
Systems Implementation (Conversion)
Fifth Phase; converting the old system to the new one and training people to use the new system.
Sixth Phase; periodically evaluating and updating system as needed
Computer professionals who typically conduct systems analysis and design; plans and designs information systems.
Chart showing the levels of management and formal lines of authority in an organization.
A list of questions helps guide the systems analyst and end user through key issues for the present system.
Method used to identify top-level components of a system, then break these components down into smaller parts for analysis.
Chart that shows the relationship between input and output documents.
Table showing decision rules that apply when certain conditions occur and what action should take place as a result.
A flowchart that shows the flow of input data to processing and finally to output, or distribution of information.
Systems Analysis Report
Report prepared for higher management describing the current information system, the requirements for a new system, and a possible development schedule.
Comparing the costs of a new system to the benefits it promises.
Hardware and software reliability; available training
Will the system work within the organization?
Systems Design Report
Report for higher management describing alternative designs, presenting cost versus benefits, and outlining the effects of alternative designs on the organization.
The old system is simply abandoned for the new system; is very risky and not recommended
The old and new systems are operated side by side until the new one has shown it is reliable; very expensive and not recommend.
The new system is tried out in only one part of the organization. Later it is implemented throughout the rest of the organization.
The new system is implemented gradually over a period of time.
Comparing the performance of a new system to the original design specifications to determine if the new procedures are actually improving productivity.
Prototyping and RAD
Two alternatives to the System Life Cycle
Building a model or prototype that can be modified before the actual system is installed.
Rapid Applications Development (RAD)
Uses powerful development software and specialized teams as an alternative to the systems development life cycle approach.
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