Systems Development Life Cycle
•The Analysis Phase
•Introduction to process modelling

What is the System
Development Cycle?
What is an information system (IS)?

Hardware,
Hardware,software,
software,data, data, people, people,and andprocedures proceduresthat that work worktogether togetherto toproduce produce quality qualityinformation information

System—Set
System—Setof
ofcomponents components that thatinteract interactto toachieve achieve common commongoal goal Businesses
Businessesuse
usemany manytypes typesofof systems systems

Next

What is the System
Development Cycle?
What are the phases of the system development cycle?
Phase 2. Analysis


Phase 1.
 Planning
Review project requests





Prioritize project requests Allocate resources
Identify project development team



Conduct preliminary investigation
Perform detailed analysis activities:
Study current system
Determine user requirements
Recommend solution

Phase 5. Support





Conduct post-implementation system review
Identify errors and enhancements
Monitor system performance

Phase 3.
 Design
Acquire hardware



and software, if necessary Develop details of system Phase 4.
 Implementation
Develop programs, if necessary




Install and test new system
Train users
Convert to new system
Next

What is the System
Development Cycle?
What are guidelines for system development?
Arrange tasks into phases
(groups of activities)
Involve users (anyone for whom system is being built)

Develop clearly defined standards (procedures company expects employees to follow)
Next

What is the System
Development Cycle?
Who
participates in the system development life cycle?

Next

What is the System
Development Cycle?
What is a systems analyst?
Responsible for designing and developing information system
Liaison between users and IT professionals

Next

What is the System
Development Cycle?
What is the project team?
Formed to work on project from beginning to end

Consists of users, systems analyst, and other IT professionals
Project leader—one member of the team who manages and controls project budget and schedule

Next

What is the System
Development Cycle?
What is project management?



Process of planning, scheduling, and controlling activities during system development cycle
Project leader identifies elements for project

Goal, objectives, objectives, and and expectations, collectively called called scope

Required activities

Time
Time estimates estimates for for each each activity

Cost estimates for each each activity

Order
Order of of activities activities Activities
Activities that can take place place at at same same time

Next

What is the System
Development Cycle?
What is a Gantt chart?


Popular tool used to plan and schedule time relationships among project activities

Next

What is the System
Development Cycle?
What is project management software?


Program (such as Microsoft Office Project 2003) used by project leaders to plan, schedule, and control projects Next

What is the System
Development Cycle?
What is feasibility?
Operational
feasibility

Measure of how suitable system development will be to the company Four feasibility tests: Economic feasibility (also called cost/benefit feasibility)

Schedule feasibility Technical feasibility Next

What is the System
Development Cycle?
What is documentation?
Collection and summarization of data and information
Includes reports, diagrams, programs, and other deliverables
Project notebook contains all documentation for single project

Next

What is the System Development
Cycle?
What are six data and information gathering techniques?








Review documentation
Observe
Questionnaire
Interview
Joint-application design (JAD) session
Research
Next

What Initiates the System
Development Cycle?
What are some reasons to create or modify an information system?
To correct problem in existing system

To improve existing system

Outside group may mandate change

Competition can lead to change