4-IS II GUC 2009 2010 spring- lecture 4

4-IS II GUC 2009 2010 spring- lecture 4 - Information...

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Unformatted text preview: Information Systems II Lecture 4 Chapter 13: Building Systems Dr. Hany Ismail 2 Chapter 13: LEARNING OBJECTIVES Part 1 Systems as Planned Organizational Change Part 3 Alternative Systems-Building Approaches Part 2 Over view of Systems Development Part 4 Application Development for the Digital Fir m 3 In Chapter 13, Do not Study I n Chapter 13 , Do not Study: From (middle of) page 522 to page 526 AND from page 533 t o page 536 ( section 13.4 ) 4 Systems development: Activities that go into producing an information system solution to an organizational problem or opportunity are called: Systems development Process 1. Systems analysis 2. Systems design 1. Programming 2. Testing 3. Conversion 4. Production and maintenance Part 2 Over view of Systems Development 5 (1) Systems analysis Analysis of problem Defining the problem and identifying causes Specifying solutions Written systems proposal report describes costs and benefits of each alternative solution Identifying information requirements to be met Who needs what information where , when , and how Includes feasibility study Is solution a good investment ? Is required technology , skill available ? The Systems Development Part 2 Over view of Systems Development 6 (2) Systems design Describe system specifications that will deliver functions identified during systems analysis Should address all managerial , organizational , and technological components of system solution Role of end users User information requirements drive system-building Users must have sufficient control over design process to ensure that system reflects their business priorities and information needs The Systems Development Part 2 Over view of Systems Development 7 OUTPUT Content Timing INPUT Origins Flow Data entry USER INTERFACE Simplicity Efficiency Logic Feedback Errors DATABASE DESIGN Logical data model Volume and speed requirements File organization and design Record specifications PROCESSING Computations Program modules Required reports Timing of outputs MANUAL PROCEDURES What activities Who performs them When How Where CONTROLS Input controls (characters, limit, reasonableness) Processing controls (consistency, record counts) Output controls (totals, samples of output) Procedural controls (passwords, special forms) SECURITY Access controls Catastrophe plans Audit trails DOCUMENTATION Operations documentation Systems documents...
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4-IS II GUC 2009 2010 spring- lecture 4 - Information...

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