The document describes the program development cycle which involves 4 phases: 1) Design - planning the solution to a problem, 2) Implementation - coding the program, 3) Testing - finding and fixing errors, and 4) Improvement - enhancing the program based on testing. It then provides more details on each step, including designing the program structure and interface, coding, unit and integration testing, debugging errors, and documenting the program.

1. The Program Development Cycle
Grade 10 – Computer Programming

2. Program Development Cycle
Modern software developers base many of their
techniques on traditional approaches to
mathematical problem solving.
One such approach is based on the how engineers
solve problems.

3. Program Development Cycle
Engineers must:
• Design a solution to a problem
• Implement the solution
• Test the solution
• Fix any errors in the solution

4. Program Development Cycle
This approach can be used in computer
programming:
• Design a solution to a problem (design a
program)
• Implement the solution (code the program )
• Test the solution (test the program)
• Fix the solution (debug the program)

7. Program Development Cycle
Once the software is working, improvements
can be designed into the system. This leads back to
design, creating a four-phase cycle.

8. Program Development Cycle

9. Program Development Cycle
Designing the Structure
Find a logical sequence of precise steps that
solve the problem (aka the algorithm). The logical
plan may include flowcharts, pseudocode, and top-
down charts.

10. Program Development Cycle
Design the interface – Select objects (text boxes,
buttons, etc.).
Determine how to obtain input and how the output will
be displayed. Objects are created to receive input and display
output. Appropriate menus, buttons, etc. are created to allow
user to control the program

13. Program Development Cycle

14. Program Development Cycle
The program development cycle’s
code phase includes translating a
software design into a particular
language, and then entering that
language on the computer.
During this stage that program is
written.

16. Program Development Cycle

17. Program Development Cycle
Testing is the process for finding errors.
Debugging is the process for correcting errors
Does the new method do what it is supposed to do?
This is known as a test for correctness. Tests for
correctness measure whether the program meets the
original specifications.

18. Program Development Cycle
Testing can be rather complicated:
Is the method reasonably efficient? How much time
does it take for the method to complete its task, and
how much space does it use?

19. Program Development Cycle
Testing can be rather complicated:
Does the method have any undesirable side effects?
How does one program affects the performance of
another program, or one method affects another
method?

20. Program Development Cycle
Programmers perform unit tests and integration tests.
A unit test checks to see if a method works as
expected all by itself.
An integration test checks to see if a method
works in combination with other methods.

21. Program Development Cycle

22. Program Development Cycle
The causes of any problems
discovered during testing need to
be isolated. Here unit tests are
most helpful.
Once you know the cause, you can
develop a plan for fixing the
problem, modify the necessary
methods, and then test again.

23. Program Development Cycle

24. Documentation is necessary to allow another
programmer or non-programmer to understand
the program. Internal documentation, known as
comments, are created to assist a programmer. An
instruction manual is created for the non-
programmer. Documentation should be done
during the coding stage.
Documentation