Program Development Cycle

1. Program Development Cycle Skill Area 304.2 Prepared by DhimasRuswanto, BMm

2. Lecture Overview • Program Development Life Cycle • Characteristics of a good program • Types of errors

3. Project Management

4. Program DevelopmentLife Cycle

5. Program Development Life Cycle • The program development process is part of the software lifecycle, characterized by the following stages: • Requirements analysis • Design • Coding • Testing • Implementation and support • Documentation

6. Requirements Analysis • An accurate and complete set of client and user requirements is produced to determine the characteristics of an acceptable solution

7. Requirements Analysis (cont’d) The requirements analysis specification will contain: • the proposed system or solution, which has been agreed by the client and developer • a list of existing tools, new tools,required facilities and people available for developing the solution • a schedule for the next stages of the project, including the deliverables for each stage

8. Design Stage • Use of proper design techniques to illustrate the program specification in a systematic way • Representing the tasks required in the program specification showing all input, processing and output requirements • Examples : • Flowchart • Pseudocode • JSP

9. Coding Stage • Produce the programs that will make up the system • Translation of design into programming language code e.g. C, C++, Pascal, Qbasic • aka implementation • Complete when all code is written and documented, and compiles without any errors

10. Testing Stage • Debugging – Done by Development Team - The task of finding and removing errors/bugs from the program. • Testing – Done by Testing Team – The task of locating and identifying of bugs/errors included

11. Testing Stage (cont’d) • When the program is completed and all separate modules have been tested, a full test of the program is performed • any errors in the program will be corrected and the test repeated • Types of Tests: • Alpha test • test of the finished application completed internally • Beta test • tested externally

12. Implementation and Support • When all the previous stages have been completed satisfactorily, the system is ready for implementation • Program is transferred to the user’s machine and made to work. • 3 strategies: • The new program may run concurrently with the old one • it may completely replaced the old one or • It may phased in gradually

13. Implementation and Support (cont’d) • Once the program is installed and operated, it will be monitored for some time to ensure that program is error-free. – Support/Maintenance Stage • Maintenance includes error fixing, updates and modifications.

14. Documentation Stage • All processes in all stages during the system development must be documented/written down. • This documentation is vital for future reference/for future maintenanceof the program.

15. CHARACTERISTICS OF A GOOD PROGRAM • Correctness – fulfilling user requirements • Reliability – it produces correct output and validates input data to avoid program crash • Portability – easily installed from one machine to another with minimal modification • Maintainability – easily followed and modified, not only to the programmer who wrote it • Readability – clearly documented • Use of resources – fast in processing, uses minimum storage space and able to run on existing hardware.

16. TYPES OF ERRORS • Syntax – error relating to the programming language used • Logical – error in programming logic • Run-time/execution– error that appears after you compile and run your code

17. SUMAMRY • Program Development Life Cycle: • Requirements analysis • Design • Coding • Testing • Implementation and support • Documentation • Types of Errors • Syntax • Logical • Run-Time