1. Introduction to Computers
Lesson 12B
Introduction to Computers

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

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

4. 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

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

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

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

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

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

10. Two Alternative Development Phase Paths
Acquisition
Local development

11. Implementation Phase
The project team installs the hardware and software

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

13. Conversion Methods
Direct
Parallel
Phased
Pilot

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

15. Building Information Systems
Lesson 12B
Building Information Systems

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