1. Week 10 Systems Development

2. Thus far..exposed to Constitutional Systems Database Systems KMS
Other systems in passing (RFID driven, CRM driven) etc.
But…

3. Why Develop an IS? An opportunity (proactive) A problem (reactive)
Potential increase in revenue
Reduction of costs
Gain in competitive advantage
A problem (reactive)
Undesired situation
A directive
An order to take action

4. The Systems Development Life Cycle (Cont.)

5. The Systems Development Life Cycle (Cont.)

6. Analysis Investigation
Developers interview managers and perspective users to determine business needs
Three feasibility studies performed

7. Analysis (Cont.) Technical Feasibility Study
Ensures hardware and software exist to build the system
Economic Feasibility Study
Determines resources needed for implementation
Determines if benefits outweigh the costs

8. The Systems Development Life Cycle (Cont.)

9. Analysis (Cont.) Operational Feasibility Study Requirements Definition
Determines if system will be used as intended at its full capacity
Requirements Definition
Specific features and interface requirements of the system defined

10. The Systems Development Life Cycle

11. Design
Translation of user requirements into detailed functions of the system
Input files
Procedures
Output files
User Dialog
Interfaces

12. Design (Cont.)

13. Design (Cont.) Software development tools Flowcharts
Graphical symbols illustrating system
Logical and physical elements
Over 30 symbols for events, hardware, processes and more

14. Design (Cont.)

15. Design (Cont.) Software development tools Data flow diagram
Describe flow of data in system with only four symbols:
External entities
Processes
Data stores
Data direction

16. The Systems Development Life Cycle (Cont.)

17. The Systems Development Life Cycle (Cont.)

18. Design (Cont.) Software development tools Unified Modeling Language
Graphical standard for visualizing, specifying, and documenting software
Independent of programming language
Describe types of software
Use case, class, interaction, state, activity, and physical components

19. The Systems Development Life Cycle (Cont.)

20. Design (Cont.) Construction Systems Testing Programming
Checked against system requirements
Attempts to make system fail

21. Implementation Training Conversion Parallel Conversion
Phased Conversion
Cut Over Conversion
Pilot Conversion

22. Implementation (Cont.)

23. Support

24. Prototyping Systems developed using an iterative process
Purpose is to develop a working model as quickly as possible, which can be tweaked and revised
Significantly shortens systems development backlog
Can increase risk of incompatibility and other unforeseen mishaps

25. Prototyping (Cont.)

26. Prototyping (Cont.)

27. Integrated Methodology
Business Integration Methodology
Strategy
Process
Change management
Technology

28. Summary The SDLC is the traditional approach to systems development
There are pros and cons to prototyping
Software tools facilitate monitoring and controlling system development
There are advantages and disadvantages to different system conversion methods