scope of a software development life cycle

Questions are:

Question 1 Within the scope of a software development life cycle,

explain the importance and activities within the testing phase. In addition, How does the testing phase relatesto other phases in the life
cycle.

Question 2 What isthe difference between testing and debugging? Show an example.

Question 3 Why is it important to develop test casesfor both set ofvalid and invalid program behaviors? Explain your answer with an example.

Question 4 Suppose you are testing a code component and you discover a defect: it calculates an output variable incorrectly.

(a) How would you classify this defect?

(b) What are the likely causes ofthis defect?

(c) What steps could have been taken to prevent this type of defect from propagating to the code?
Question 5 You are developing a module whose logic impacts on data acquisition for a flight control system. Your test manager has given
you limited time and budgetto test the module. The module is fairly complex; it has many loops, conditional statements, and nesting levels.
You are going to unit testthe module using white box testing approaches. Describe three test adequacy criteria you would consider applying
to develop test cases forthis module. What are the pros and consfor each. Which will have the highest strength?
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