1. Maintaining Information Systems Class 27

2. SDLC Project Identification & Selection Project Initiation & Planning Analysis Logical Design Physical Design Implementation Maintenance **

3. Maintenance Changes made to a system to fix or enhance its functionality Why is it needed?

4. Types of Maintenance

5. Systems Life Cycle Design Concept Plan Analyze Design Implement Maintain

6. System Maintenance Process Obtain maintenance requests SSR, CR, SMR Transform requests into formal changes / Identify what parts of the system need to be changed Secure resources to implement the change Design, Code, TEST, and Implement chages Monitor changes Update HW, SW documentation

8. Managing Maintenance Controlling maintenance requests Forms Review Committee Planning Who does it?

9. Managing maintenance (cont) How is effectiveness (quality) measured? Main point: without measuring and/or tracking maintenance activities, you can’t improve. Configuration / Version management

10. Cost of Maintenance New Development Maintenance 35-40%40-60%70-80% 1970’s1980’s 1990’s

11. Maintenance Cost Factors Defects Customers Documentation Personnel Tools Software Structure

12. Programmers Working on Maintenance Programmers on Programmers on Year New Programs Maintenance 1950 90 10 1960 8,500 1,500 1970 65,000 35,000 1980 1,200,000 800,000 1990 3,000,000 4,000,000 2000 4,000,000 6,000,000

13. CASE Tools for Maintenance CASE System Documents (DFDs, Screen Designs) New Source CodeNew System Docs