BCS TM12 Exam - Topic 5 Question 122 Discussion

Actual exam question for BCS's TM12 exam

Question #: 122
Topic #: 5

[All TM12 Questions]

Based on the historical data of 5 past and similar projects, you have calculated these average numbers of defects detected in system testing:

- for each 10000 LOC (lines of code), 200 defects

- for each person-month of development team effort, 49 defects

You want to use this information to perform estimation for a new project.

The project manager tells you that he/she has estimated 20000 new LOC for this new project.

Four developers work for four months on this project before system testing.

During system testing, 797 defects are discovered.

Assume that the system test of this new project is using the same amount of work as spent in the past projects.

Based on this information only, which of the following statement is certainly true about this project?

Number of correct responses: 1

AThe code for the new project contains a higher defect density than the code of the past projects

BThe number of defects found during the system test phase on the new project is approximately proportional to the development team effort

C40000 LOC have been delivered to system testing (against the 20000 LOC planned by the project manager)

DMore LOC than planned have been delivered to system testing with a higher defect density than the past projects

Show Suggested Answer

Suggested Answer: B

by Tamala at Mar 08, 2026, 03:24 AM

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27 days ago

I remember that defect density is calculated based on LOC, so if we have 20000 LOC, we should expect around 400 defects, not 797.

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