Midterm Qs : Theory

Question 1

What is legacy code?

Answer 1

code that continues to meet needs of the customers but is difficult to evolve

Question 2

What is beautiful code?

Answer 2

Long-lasting code that is easy to evolve and meets customers needs.

Question 3

Why is it important to deal with legacy code?

Answer 3

It might be difficult to rewrite old software

Question 4

What is quality assurance?

Answer 4

Process or standards that result in high quality products and improve the manufacturing process

Question 5

What is quality software?

Answer 5

Software that meets the costumers needs and is easy to evolve
Quality == “fitness for use”

Question 6

What does verification mean?

Answer 6

Did you build the thing right? (Did you meet the specification?)

Question 7

What does validation mean?

Answer 7

Did you build the right thing? (Is this what the customer wants? That is, is the specification correct?)

Question 8

What do we do to assure software quality?

Answer 8

Testing!

Question 9

What is the approach that makes exhaustive teaching feasible? Divide and?

Answer 9

Divide and Conquer. We can significantly cut down the number of test cases by approaching the problem hierarchically.

Question 10

What are the different types of tests?

Answer 10

Unit testing: makes sure a single procedure does what was expected
module testing: tests across individual units, classes
integration testing: ensures that the interfaces between the units have consistent assumptions and communicate correctly
system/acceptance testing: tests to see if the integrated program meets its specifications

Question 11

What is test coverage?

Answer 11

The percentage of code lines that were run by the test suite.
100% test coverage != no bugs.
Not 100% test coverage != bugs are present.

Question 12

What does regression testing mean?

Answer 12

automatically rerunning old tests so new changes don’t break old code.

Question 13

How did software engineering originate?

Answer 13

Margaret hamilton used the term to distinguish it from hardware and other kinds of engineering

Question 14

What is Continuous Integration Testing?

Answer 14

regression testing every time new code is added

Question 15

What does Plan-and-Document mean?

Answer 15

Extensive planning upfront

Question 16

The concept behind the P and D models.

Answer 16

extensive planning before you ever start coding and write detailed documentation

Question 17

Why don’t P and D models work well?

Answer 17

• changes require extensive changes in the documentations
  -went over timelines
  -changes occur during production

Question 18

What was a model that tried to fix it by using prototypes?

Answer 18

Spiral.
Uses 4 large iterations
1) Determine objectives and constraints of this iteration.
2) Evaluate alternatives and identify and resolve risks.
3) Develop and verify the prototype for this iteration.
4) Plan the next iteration.

Question 19

What’s in the Agile Manifesto?

Answer 19

• Individuals and interactions over processes and tools
• Working software over comprehensive documentation
• Customer collaboration over contract negotiation
• Responding to change over following plans

Question 20

What is the bad part of Spiral?

Answer 20

Iterations were too long apart from each other(months and years vs days and weeks)

Question 21

Who created the concept of Extreme Programming?

Answer 21

Kent Beck.

Question 22

Does XP advocate shorter or longer iterations?

Answer 22

Shorter iterations. One- to two-week iterations.

Question 23

Does XP advocate writing tests before code or tests after code?

Answer 23

Write tests before code, either using Behavior Driven Design or Test Driven Design. “Write the tests before you write the code.”

Question 24

Does XP advocate working alone or working in pairs?

Answer 24

Working in pairs.

Question 25

What does Agile emphasize to reduce mistakes?

Answer 25

Test-driven development(TDD)

Question 26

What does Agile emphasize to validate customer requirements?

Answer 26

User Stories.

Question 27

What does Agile emphasize to measure progress?

Answer 27

Velocity.

Question 28

Does Agile emphasize refining a working but incomplete prototype?

Answer 28

Yes. “Developers should continuously refine a working but incomplete prototype until the customer is happy with the result, with the customer offering feedback on each iteration.”

Question 29

How often in Agile do you get feedback from the customer/boss?

Answer 29

Each iteration; 1 - 2 weeks

Question 30

Is Agile an accepted practice?

Answer 30

It wasn’t at first but now it is because of its success rate.

Question 31

What’s in the Agile Manifesto?

Answer 31

• Individuals and interactions over processes and tools
• Working software over comprehensive documentation
• Customer collaboration over contract negotiation
• Responding to change over following plans