1 Purpose
A data flow diagram is a logical model of the flow of data through a system that shows how the system’s boundaries, processe and data entities are logically related.
Ikhwan Arief
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1 Purpose
An expert system (or knowledge-based system) is a computer program that emulates the thought process of a human expert. This chapter defines several key terms and examines the process of creating an expert system.
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1 Purpose
The objective of the object-oriented approach to software development is to support creating software that is easier to change, debug, and maintain than is traditional software. Today, object-oriented principles are also applied to system development.
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“Structured Analysis and Design” is divided into two components: structured analysis as defined by DeMarco2 and structured design as defined by Yourdon and Constantine4. Structured analysis is a front-end methodology that allows users and/or systems analysts to convert a real-world problem into a pictorial diagram or other logical representation that can subsequently be used by the systems developers and/or programmers to design an information system. Structured design is concerned with physical design based on the results of structured analysis. More generally, structured analysis transforms the abstract problem into a feasible logical design, while structured design concentrates on converting the logical design into a physical information system.
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1 Purpose
The purpose of a methodology is to specify a set of well-defined steps or phases, coupled with a set of clear, measurable exit criteria, for solving a complex problem (such as developing an information system). The system development life cycle (SDLC) is a set of steps that serves as the basis for most systems analysis and design methodologies.
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