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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.

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  • 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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first question mae MTTR kaya hai 2nd question to ho gaya

MTTR (Mean Time To Repair)

i said MTTR not MTBF

handouts mae MTBF ka formula hai


MTTF to question mae diya hova hai but what is MTTR

Es main Availability wala formula use ho ga.

Availability = (MTTF/MTBF) x 100

and ye jo 92% hai is ka kaya karna hai question 1 mae kahi yahi to nhe MTTR




Ei kia hai????????

Ei is the total number of errors uncovered during the ith step in the SE process





1st mein


just values put krni hain?


MTBF ki value calculate krni hy


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