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Download Analysis and Design of Information Systems by Arthur M. Langer (auth.) PDF

By Arthur M. Langer (auth.)

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Extra resources for Analysis and Design of Information Systems

Sample text

The first is a prototype drawing of the house, representing how the house will appear to the homebuilder. The second is the blueprint, which represents the engineering requirements. Although the homebuilder may look at the blueprint, it is meant primarily for the builder or contractor who will actually construct the house. What has the architect accomplished? The homebuilder has a view of the house to verify the design, and the builder has the specifications for construction. Let us now translate this process to that of designing software.

Mr. Smith has been running this operation manually for over 25 years. Assignment Prepare 15 questions that you would ask Mr. Smith during the interview. 3 Overview of Analysis Tools The Concept of the Logical Equivalent The primary mission of an analyst or systems designer is to extract the physical requirements of the users and convert them to software. All software can trace its roots to a physical act or a physical requirement. A physical act can be defined as something that occurs in the interaction of people, that is, people create the root requirements of most systems, especially those in business.

Legacy System: where the existing system has never been modeled; any new modeling will therefore be incorporating analysis tools for the first time. Pre-Modeled Simply put, a Pre-Modeled product is already in a structured format. A structured format is one that employs a specific format and methodology such as the data flow diagram. The most challenging aspects of changing Pre-Modeled tools are: 1. keeping them consistent with their prior versions, and 2. implementing a version control system that provides an audit-trail of the analysis changes and how they differ from the previous versions.

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