Discuss BCS TM12 Exam Topic 5 Question 122

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

Suggested Answer: B

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26 comments · newest first

Alyssa 2 months ago

D feels too extreme. Higher density could be true though.

Pearly 2 months ago

C doesn't make sense. Only 20000 LOC planned.

Amalia 2 months ago

Not sure, but B seems reasonable too.

Michell 2 months ago

I think option A is likely true.

Rickie 2 months ago

D sounds plausible. Higher defects could mean more LOC delivered.

Leonor 2 months ago

C is definitely wrong. Only 20000 LOC were planned.

Eleonora 3 months ago

I lean towards B. More effort usually means more defects found.

Laurel 3 months ago

I think A might be true. 797 defects seem high.

An 3 months ago

D is misleading. We can't assume more LOC without proof.

Sabrina 3 months ago

C seems off. Only 20000 LOC were planned.

Phuong 3 months ago

I feel B makes sense. Defects relate to effort.

Stevie 4 months ago

I think A is true. Higher defect density is likely.

Adelle 4 months ago

I agree, higher defect density seems likely with those numbers.

Elliot 4 months ago

Definitely more LOC than planned, but not sure about the defect density.

Silvana 5 months ago

Wait, are they saying 40,000 LOC were delivered? That seems off!

Thaddeus 6 months ago

I think the defects found are pretty much in line with the effort.

Sean 6 months ago

The average is 200 defects per 10,000 LOC.

Shelton 6 months ago

I agree, the defect density seems higher than before!

Elenore 6 months ago

Definitely more LOC than planned, but not sure about the defect density.

Leanna 6 months ago

Wait, are we sure they delivered 40k LOC? That seems off.

Suzi 6 months ago

I think the defects found are pretty much in line with the effort.

Mozell 7 months ago

The average is 200 defects per 10k LOC.

Nada 7 months ago

I’m leaning towards option D because if they found more defects than expected, it suggests a higher defect density, but I’m not completely confident about the LOC delivered.

Markus 7 months ago

I feel like I’ve seen a question like this before, and I think we can’t definitively say anything about the defect density without more context on the past projects.

Pok 7 months ago

I think option B might be true because the number of defects usually correlates with the effort, but I'm not entirely sure how to prove it with just this data.

Sueann 7 months 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.

BCS TM12 Exam - Topic 5 Question 122 Discussion