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                          Assignment No. 04
                        Semester: Spring 2017

CS605: Software Engineering II

Total Marks: 10


Due Date: 27th July 2017



Please read the following instructions carefully before submitting assignment:

You need to use MS word document to prepare and submit the assignment on VU-LMS.

It should be clear that your assignment will not get any credit if:


  • The assignment is submitted after due date.
  • The assignment is not in the required format (.doc or docx)
  • The submitted assignment does not open or file is corrupt.
  • Assignment is copied(partial or full) from any source (websites, forums, students, etc)






The objective of this assignment is to learn about:


  • Software reliability
  • Statistical Software Quality Assurance






























Question No. 1


“Mira Soft” software house is currently working on a project of bank transaction system, while evaluating the software reliability of this project it was found that availability was 92% and MTTF (Mean Time to Failure) is 48. You are required to calculate the Mean time between failure (MTBF) of this project and provide your answer in the following table:








Question No. 2


“Alpha Soft” software house is working on a project of school management system, for this project information about defects is collected for first step and categorized as Incomplete or erroneous specifications (IES), The following data is collected for this category:



Error Category










ws, wm, wt  are weighting factors for serious, moderate, and minor errors.

Recommended values for these are 10, 3, 1 respectively.


You are required to calculate Phase Index for this step.










Best of Luck!


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