Systems analysis and development CIS210 ch 16

CIS 210 Systems Analysis and Development Week 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 – – – – – – – 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 – – – – 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 – – – – Corrective Adaptive Perfective Preventive • Cost of Maintenance – Maintainability • • • • • • 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 – – – – – Continuous operation Broken links HTML validation Re-Registration Future editions Summary • • • • • • The maintenance process Deliverables and outcomes Types of maintenance Cost of maintenance Managing maintenance Website maintenance ... 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. .. Transforming requests into changes Designing changes Implementing changes • Deliverables and Outcomes – New versions of software – New versions of documentation Conducting Systems Maintenance • Types... Begins directly after installation Software changes Hardware changes Changes in procedures How long to maintain? Issues to consider Maintaining Information Systems • The Maintenance Process – – –