2.3 Producing Robust Products

Question 1

What is anticipating misuse?

Answer 1

Planning ahead to take steps against potential misuse like

Question 2

What is input sanitisation?

Answer 2

Checking and cleaning up data that has been input like removing special characters to prevent an SQL injection

Question 3

What is validation?

Answer 3

Checking if input data follows a specific criteria and should be followed?

Question 4

What is verification?

Answer 4

Checking whether data entered is correct

Question 5

What is authentication and what are some examples?

Answer 5

Ensuring only authorised users can gain access to a system though usernames, passwords, PIN’s, email

Question 6

What do different types of checks do?

Answer 6

• Range check - checks data is within a certain range
• Presence check - checks data has actually been entered and not kept blank
• Length check - checks the length of an input is within a certain amount
• Type check - Checks data is a certain data type
• Format check - checks data is entered in a certain way
• Lookup Table - a table of acceptable entries, AKA a list

Question 7

Why use sub programs?

Answer 7

Allows you to reuse code, making it easier to test.

Question 8

Why use naming conventions?

Answer 8

Ensure purpose of variable is immediately understood

Question 9

Why use indentation?

Answer 9

Improve readability and clearly show each block of code

Question 10

Why use comments?

Answer 10

• People looking at your code can see what it is doing/performing
• Important in collaboration, to understand others ideas
• Enhanced readability

Question 11

What are syntax errors?

Answer 11

Errors which break the grammatical rules of the programming language and stop it from being run/translated

Question 12

What are logic errors?

Answer 12

Errors which produce unexpected output

Question 13

What is normal test data?

Answer 13

Data which should be accepted by a program without causing errors

Question 14

What is boundary test data?

Answer 14

Data of the correct type which is on the very edge of being valid

Question 15

What is erroneous data?

Answer 15

Data of the incorrect data type which should be rejected by a computer system

Question 16

What is invalid data?

Answer 16

Data of the correct data type which should be rejected by a computer system

Question 17

What is iterative testing?

Answer 17

• Takes place during development program
• Programmer develops a module, tests it and repeats until module works as expected

Question 18

What is final/terminal testing?

Answer 18

• Takes place after development and before program released to the intended user
• Takes place after all modules have been individually tested to ensure whole program works as expected

Question 19

Purpose of testing?

Answer 19

Ensure program works correctly no matter what input the user enters