The document outlines the program development cycle, which involves designing the program, writing methods to implement the design, testing the methods, and debugging any errors found. It describes each step in more detail: in the design step, the problem is broken down into a series of steps using pseudocode or a flowchart; methods are then written to reflect these steps; testing ensures the program meets its intended purpose without errors or inefficiencies; and debugging identifies and corrects any logical errors in the program's instructions or implementation.

1. Chapter 1
Program Development Cycle

2. Designing a Program
 Design requires planning…that follows the above steps
 Called Program Development Cycle
 Cycle is repeated until NO errors appear in the program.
Design the program Write the methods Test the methods Debug the methods

3. Designing the Program
 Determine what the app is supposed to do.
 Read a problem statement that describes the which objects will
appear in the app, and the actions that are to take place.
 What is the “Story”?
Design the program Write the methods Test the methods Debug the methods

4. Designing the Program
 Break the problem
statement down
into series of steps
 Pseudocode
 Algorithm
or
 Flowchart
Design the program Write the methods Test the methods Debug the methods

5. Writing the methods
 Design steps (pseudocode or flowchart) provides model for writing
the methods
 Drag tiles into Editor to assemble instructions
 Instructions should follow the order of the Design steps
 Pseudocode and flowchart may NOT be at the detail of the final
instructions
 This step becomes more involved when you begin to write your own
methods.
Design the program Write the methods Test the methods Debug the methods

6. Testing
 Test to make sure it meets the following criteria:
 Does it do what it was intended to do?
 Does it have any errors? Any undesired results?
 Is it efficient? Are there unnecessary steps?
 If the criteria are NOT met, then debugging occurs
 Always create the program in small parts to make testing easier
Design the program Write the methods Test the methods Debug the methods
TEST! TEST! TEST!

7. Designing a Program
 Debugging means to determine what must be corrected or modified to
get the program to work correctly
 Logical errors (bug) is a mistake
that produces an incorrect result,
but the program still runs.
 Instructions in an incorrect order
may produce incorrect results
 Passing incorrect values as arguments
can cause logical errors
 What is the logical error?
 Syntax errors are instructions written
incorrectly in a language
Alice has no syntax
Design the program Write the methods Test the methods Debug the methods

8. Checkpoint
 1. What are the steps in the program
development cycle?
 2. What are two tools that you can use to
break down a problem into a series of steps?
 3. What is a logical error?
 4. When testing a method, what are three
criteria that you should make sure the method
meets?
2-8
2.3