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Systems Analysis and Design, 4th Edition by Roberta M. Roth, Barbara Haley Wixom, Alan Dennis

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CHAPTER 7

MOVING INTO DESIGN

The design phase of the SDLC uses the requirements that were gathered during analysis to create a blueprint for the future system. A successful design builds on what was learned in earlier phases and leads to a smooth implementation by creating a clear, accurate plan of what needs to be done. This chapter describes the initial transition from analysis to design and presents three ways to accomplish the design for the new system.

OBJECTIVES

  • Understand the initial transition from analysis to design.
  • Understand how to create a system specification.
  • Be familiar with three ways to acquire a system: custom, packaged, and outsourced alternatives.
  • Be able to create an alternative matrix.

CHAPTER OUTLINE

Introduction

Transition from Requirements to Design

System Acquisition Strategies

Custom Development

Packaged Software

Outsourcing

Influences on the Acquisition Strategy

Business Need

In-House Experience

Project Skills

Project Management

Time Frame

Selecting an Acquisition Strategy

Alternative Matrix

Applying the Concepts at Tune Source

Summary

INTRODUCTION

The design phase decides how the new system will operate. Many activities will be involved as the development team develops the system requirements. This chapter provides an outline of those design phase activities, which culminates in the creation of the system specification. We also describe three alternative ...

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