Introduction to Computers Lesson 12B Introduction to Computers

Systems Development Life Cycle (SDLC) SDLC is an organized way to build an information system

The SDLC is a Series of Five Phases Needs analysis Systems design Development Implementation Maintenance

Needs Analysis Phase Defining the problem and deciding whether to proceed Analyzing the current system in depth and developing possible solutions to the problem Selecting the best solution and defining its function

Several Ways to Document Problem or System Data flow diagram Structured English Decision tree

Systems Design Phase The project team tackles the “how” of the selected solution

Examples of Answering the “How” Top-down design Bottom-up design

System Design Tools Working models, called prototypes Computer-aided software engineering (CASE) tools

Development Phase The programmers create or customize the software for the various parts of the system

Two Alternative Development Phase Paths Acquisition Local development

Implementation Phase The project team installs the hardware and software

Conversion The process of moving from an old computer system to a new one

Conversion Methods Direct Parallel Phased Pilot

Maintenance Phase IS professionals continue to provide support after the information systems are implemented

Building Information Systems Lesson 12B Building Information Systems

Review Questions What is SDLC? What are the five SDLC phases? What are the possible development phase paths? What is conversion?