CIS 210Systems Analysis and Development Week 9 Part I Maintaining Information Systems... Objectives • Upon completion of part I you will be able to: – Understand and be able to explain
Trang 1CIS 210
Systems Analysis
and Development
Week 9 Part I
Maintaining Information Systems
Trang 2Objectives
• Upon completion of part I you will be able to:
– Understand and be able to explain the concepts related to the four primary types of maintenance – Understand and be able to explain the concepts related to the cost of maintaining information
systems
– Understand and be able to explain the concepts related to the role of CASE when maintaining
information systems
Trang 3• System Maintenance
– Largest expenditure
– Begins directly after installation – Software changes
– Hardware changes
– Changes in procedures
– How long to maintain?
– Issues to consider
Trang 4Maintaining Information Systems
• The Maintenance Process
– Obtaining requests
– Transforming requests into changes
– Designing changes
– Implementing changes
• Deliverables and Outcomes
– New versions of software
– New versions of documentation
Trang 5Conducting Systems Maintenance
• Types of Maintenance
– Corrective
– Adaptive
– Perfective
– Preventive
• Cost of Maintenance
– Maintainability
• Latent defects
• Number of customers
• Quality of system documentation
• Maintenance personnel
• Tools
• Well-structured programs
Trang 6Conducting Systems Maintenance
• Managing Maintenance
– Managing maintenance personnel
– Measuring maintenance effectiveness
• Number of failures
• Time between failures (MTBF)
• Type of failure
– Controlling maintenance requests
– Configuration management
• System librarian
• Baseline modules
• Build routines
Trang 7Website Maintenance
• Special Issues
– Continuous operation
– Broken links
– HTML validation
– Re-Registration
– Future editions
Trang 8• The maintenance process
• Deliverables and outcomes
• Types of maintenance
• Cost of maintenance
• Managing maintenance
• Website maintenance