Introduction to SDLC: System Development Life Cycle Dr. Dania Bilal IS 582 Spring 2009

Phase 1: Planning & Selection Product identification and selection Product initiation and planning –Identify potential development projects –Classify and rank projects –Select projects for development

Phase 2: Systems Analysis Determine system requirements Select appropriate methods to elicit system requirements from users of system –Interviews, focus groups, surveys, discussions, or other techniques

Phase 3: Systems Design Structure system requirements Modeling processes Develop data flow diagrams (DFDs) based on specific rules and guidelines that lead to accurate and well-structured process models. Use DFDs to support analysis of IS

Phase 3: Systems Design –Use modeling and/or other techniques to represent data Process modeling – based on specifications Conceptual data modeling – user oriented Select best alternative design strategy using both qualitative and quantitative methods

Phase 3: Systems Design Design the human interface –Design the interaction (dialogue) –Build a prototype –Perform usability testing –Design the database

Phase 4: System Implementation & Operation Implement system: –Design specifications are turned into working computer code Test code for errors and other problems –Use a sample data set

Phase 4: System Implementation & Operation Install system Prepare documentation Train users of the system Provide support Maintain system on a regular basis

Software Engineering Process Components –Methodologies –Techniques –Tools

Methodologies Approaches taken by system developers to develop the information system –Qualitative (e.g., interviewing users) –Quantitative (e.g., collect data via direct observations of users)

Techniques Based on methodology chosen –Qualitative vs. quantitative or both Processes or procedures followed to gather data about current and/or potential users –Design interviews, observations, focus groups

IS Tools Computer-aided software engineering (CASE) –Used to develop the software Draw diagrams, models, relationships among tasks, etc.

Class Activity Work in a group for 15 minutes Examine the SDLC Assess how the SDLC may apply to purchasing a product of your choice. This can be a house, car, computer, etc.