Systems analysis and development CIS210 ch 16

CIS 210
Systems 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 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


Overview
• System Maintenance
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Largest expenditure
Begins directly after installation

Software changes
Hardware changes
Changes in procedures
How long to maintain?
Issues to consider


Maintaining
Information Systems
• The Maintenance Process
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Obtaining requests
Transforming requests into changes
Designing changes
Implementing changes

• Deliverables and Outcomes
– New versions of software
– New versions of documentation


Conducting
Systems Maintenance
• Types of Maintenance
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Corrective
Adaptive
Perfective
Preventive

• Cost of Maintenance
– Maintainability
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Latent defects
Number of customers
Quality of system documentation
Maintenance personnel
Tools
Well-structured programs


Conducting
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


Website Maintenance
• Special Issues
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Continuous operation
Broken links
HTML validation
Re-Registration
Future editions


Summary
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The maintenance process
Deliverables and outcomes
Types of maintenance
Cost of maintenance
Managing maintenance
Website maintenance