Part 1: W02 Software Quality Assurance

Question 1

What can be the quality measure of a defect based model?

Answer 1

Number of defects.

Question 2

Define “Fault/Defect” in Software Testing.

Answer 2

Manifestation of error in software.

Question 3

Define “Error” in Software Testing.

Answer 3

User mistake.

Question 4

Define “Failure” in Software Testing.

Answer 4

Software artifact not executing required action.

Question 5

What are the failure classes?

Answer 5

• Money cost
• downtime/loss of data
• harmful to environment
• loss of life

Question 6

Define “Operational Profile” in Software Testing.

Answer 6

Quantitative representation of how system will be used.

Question 7

How is Operational Profile made?

Answer 7

Documenting user inputs and their occurrence probabilities.

Question 8

Why is Operational Profile useful?

Answer 8

Used to proportionally distribute test cases and overall test time.

Question 9

What are the levels in the Operational Profile Triangle?

Answer 9

1. Customer Profile
2. User Profile
3. System-mode Profile
4. Function Profile
5. Operations Profile
6. Test Selection

Question 10

Define “Customer” in Operational Profile with examples.

Answer 10

Entity that uses results of software.

Ie. large retail stores, grocery chains.

Question 11

Define “User” in Operational Profile with examples.

Answer 11

Entity that uses software. Ie. marketing analysts, DB administrators.

Question 12

Define “System mode” in Operational Profile with examples.

Answer 12

Set of functions grouped for one executable. Ie. report generation, database cleanup.

Question 13

Define “Function” in Operational Profile with examples.

Answer 13

Set of operations grouped for one system mode.

Ie. Sales reports in Report Generation.

Question 14

Define “Operation” in Operational Profile with examples.

Answer 14

System task as viewed by user.

Question 15

What is the formula for threshold occurrence probability?

Answer 15

threshold occurrence probability = 0.5 / # of tests

Question 16

How do you allocate tests based on operational profile?

Answer 16

1. assign >=1 test case to each test with lower probability than threshold occurrence probability
2. assign 2-4 test cases to rare CRITICAL new operations
3. Use allocation probability for remaining tests

Question 17

What are the 3 testing levels?

Answer 17

Functional
Structural
Regression

Question 18

What is Functional level testing?

Answer 18

Testing as if system is black box.

Question 19

What is Structural level testing?

Answer 19

Testing as if system is white box. (Testing logic)

Question 20

What is Regression level testing?

Answer 20

Testing to catch defects across new versions.

Question 21

What type of testing stages are there?

Answer 21

• Unit testing
• Integration testing
• System testing
• User/Acceptance testing

Question 22

Define “Unit testing”.

Answer 22

Testing individual components.

Question 23

Define “Integration testing”.

Answer 23

Testing combinations of components.

Question 24

Define “System testing”.

Answer 24

Testing complete system.

Question 25

Define “User/Acceptance testing”.

Answer 25

Customer validation.