1. Learning Intention
I will learn about evaluating a program.

2. Analysis
Design
Implementation
Testing
Documentation
Evaluation

3. Program Evaluation
There are four areas to consider when evaluating a program:
Fitness for purpose
Efficient use of coding constructs
Robustness
Readability

4. Fitness for Purpose
Software that is fit for purpose - has passed it’s testing (so it’s correct) - meets all the requirements (does what it was supposed to do)

5. Efficiency
A program can be written in many different ways and do what it is expected to do
Software that is efficient uses the most efficient programming constructs to solve a problem

6. How could this be made more efficient?
DECLARE total INITIALLY 0 RECEIVE number FROM KEYBOARD SET total TO total + number SEND total TO DISPLAY

7. Using repetition (loops) can greatly reduce code
DECLARE total INITIALLY 0 FOR index FROM 1 TO 4 DO RECEIVE number FROM KEYBOARD SET total TO total + number END FOR SEND total TO DISPLAY
Using repetition (loops) can greatly reduce code

8. How could this be made more efficient?
DECLARE total INITIALLY 0 RECEIVE number1 FROM KEYBOARD RECEIVE number2 FROM KEYBOARD RECEIVE number3 FROM KEYBOARD RECEIVE number4 FROM KEYBOARD RECEIVE number5 FROM KEYBOARD SET total TO number1 + number2 + number3 + number4 + number5 SEND total TO DISPLAY

9. Using arrays can greatly reduce code
DECLARE number AS REAL INITIALLY [] FOR counter FROM 1 TO 4 DO RECEIVE number(counter) FROM KEYBOARD SET total TO total + number(counter) END FOR SEND total TO DISPLAY
Using arrays can greatly reduce code

10. How could this be made more efficient?
IF mark < 50 THEN SET grade TO D END IF IF mark >= 50 AND mark <= 59 THEN SET grade TO C IF mark >= 60 AND mark <= 69 THEN SET grade TO B IF mark >= 70 THEN SET grade TO A
Always does all 4 comparisons

11. Does 1, 2 or 3 comparisons depending on the value of mark
IF mark < 50 THEN SET grade TO D ELSE IF mark >= 50 AND mark <= 59 THEN SET grade TO C ELSE IF mark >= 60 AND mark <= 69 THEN SET grade TO B ELSE SET grade TO A END IF
Does 1, 2 or 3 comparisons depending on the value of mark

12. Using
IF ..
ELSE IF …
ELSE
is more efficient than
IF … END IF,
IF … END IF

13. Robustness
A program is robust if it does not crash, even when it is given invalid input. A robust program will not have any execution errors. A robust program should reject invalid data.

14. Readability
Readability means how easy your code is for another programmer to read.

15. Readability – White Space
Using white space means the code is spaced out to make it easier to read.

16. White space

17. Readability - Indentation
Indentation is moving code right a few spaces from the start of the line. (VB does this for you automatically).
Using indentation makes it easier to see the code inside different constructs.

18. Readability - Indentation

19. Readability – Meaningful Identifiers
Using meaningful identifiers means using names for objects (TextBoxes, ListBoxes, Buttons etc) and variables which help to describe the information they hold.

20. Readability - Meaningful Identifiers

21. Readability - Meaningful Identifiers

22. Readability – Internal Commentary
Internal commentary is comments you add to your program to help explain what the program is doing.
e.g.
- why use the variable types you did
- why that kind of loop
- what the IF statement is trying to decide
- etc.

23. Readability – Internal Commentary

24. Complete the Program Evaluation questions.
In your jotter
Complete the Program Evaluation questions.

25. I can evaluate a program in terms of:
Success Criteria
I can evaluate a program in terms of:
Efficiency
Readability
Robustness
Fitness for purpose