Supplement 2 - Supplement 2: Systems Development 2.1 How Do...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Supplement 2: Systems Development 2.1 How Do You Develop Business Information Systems? Developing an information system is a long, expensive and difficult task. Therefore, many companies try to improve their chances of success by following a proven methodology . A methodology is simply a standard process. The methodology includes detailed steps, common forms and other tools that you might use on any systems development project. 2.2 What is the SDLC? The Systems Development Lifecycle or SDLC is a common methodology that can help a team to implement a successful new information system. Other names for the SDLC is the traditional SDLC or the Waterfall Model. There are other systems development methodologies, but we will discuss the SDLC here. The SDLC is initiated because an information systems need is identified. It may be that an opportunity has been identified and it is decided that an information system will allow the company to take advantage of the opportunity. Often, projects are started because a problem exists. Although the symptoms of the problem are usually painfully obvious, the cause of the problem may not be known at the inception of the project.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The SDLC has five phases: Planning, Analysis, Design, Implementation and Maintenance. These phases are sequential, overlapping and iterative. This means that Planning needs to be done before Analysis, and both Planning and Analysis must be done before Design. The phases are overlapping, however, so some portions of the project may proceed to the next phase while others remain in an earlier phase. For example, you may have analyzed some of the components of a project fully. Those components can proceed to Design, while other components remain in Analysis. The SDLC is iterative because you can return to a phase at any point if necessary. For example, if you are implementing a part of the project and you realize the analysis is incomplete, you can return to the Analysis phase for further investigation. If you send a component back to a previous phase, you must continue through the remaining phases sequentially. In our example, when we have completed our second visit to the Analysis phase, we must send that component of the project through the Design phase again before returning to Implementation. 2.3 What is the Planning Phase? The purpose of the Planning phase of the SDLC is to answer the question: Is this project worthwhile? In this phase, we will take a look at the project from several different perspectives to determine if success is feasible. There are five different feasibility tests we can perform. 1. Economic Feasibility attempts to determine of the perceived benefits of undertaking the project outweigh the estimated costs. 2.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/08/2010 for the course ACIS 1504 taught by Professor Jmlacoste during the Spring '07 term at Virginia Tech.

Page1 / 8

Supplement 2 - Supplement 2: Systems Development 2.1 How Do...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online