Lesson 12 B Introduction to Computers Systems Development

Lesson 12 B Introduction to Computers

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

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

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 home

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

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

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

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

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

Two Alternative Development Phase Paths Acquisition Local development home

Implementation Phase The project team installs the hardware and software home

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

Conversion Methods Direct Parallel Phased Pilot home

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

Lesson 12 B Building Information Systems

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