ISTQB ATM Exam - Topic 1 Question 57 Discussion

Actual exam question for ISTQB's ATM exam

Question #: 57
Topic #: 1

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? K3 3 credits

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: C

by Louvenia at Sep 16, 2024, 05:41 AM

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Katlyn

6 months ago

40000 LOC? That sounds like a stretch!

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Janessa

6 months ago

The defects seem proportional to the effort, but still concerning.

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Earleen

6 months ago

I’m not so sure about that, could just be a fluke.

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Tammi

7 months ago

Definitely higher defect density, no doubt about it.

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Malcom

7 months ago

Looks like they found way more defects than expected!

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Janey

7 months ago

Based on the defects found, it feels like D might be true since we have more defects than expected, but I need to think more about the defect density part.

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Nada

7 months ago

I’m a bit confused about the LOC delivered. I thought we were only estimating 20000 LOC, so C seems unlikely, but I’m not entirely sure.

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Aleshia

7 months ago

I think we practiced a question similar to this where we had to relate defects to team effort. It seems like B could be a reasonable assumption.

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Kate

8 months ago

I remember that defect density is calculated based on the number of defects per LOC, but I'm not sure if we can definitely say the new project has a higher density.

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Stevie

8 months ago

I feel pretty confident about this one. Calculating the expected defects and comparing to the actual should give me the answer I need. Just need to be careful with the math.

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Lili

8 months ago

This seems like a tricky one. I'll need to double-check my work to make sure I'm not missing anything. The information provided seems a bit incomplete.

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Dona

8 months ago

Okay, I think I've got it. The key is to use the historical averages for defects per LOC and per person-month to estimate the expected defects, then compare that to the actual 797 defects found.

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Tawna

8 months ago

Hmm, I'm a bit confused about how to use the historical data to estimate the defects for this new project. I'll need to think through the logic carefully.

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Alpha

8 months ago

This question seems straightforward. I'll start by calculating the expected number of defects based on the historical data and compare that to the actual number found.

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Gracia

8 months ago

I'm a bit confused by the different date formats in the XML structures. I'll need to make sure I understand how to properly extract the year information from each one.

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Terrilyn

1 year ago

Haha, looks like the project manager needs to work on their estimation skills. Option C is definitely the way to go here.

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Ressie

11 months ago

Looks like the project manager got it wrong this time.

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Hyun

11 months ago

I agree, the project manager definitely needs to improve their estimation skills.

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Coral

11 months ago

Option C) 40000 LOC have been delivered to system testing (against the 20000 LOC planned by the project manager)

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Micaela

1 year ago

I'm not sure about the proportionality between defects and development team effort. Option B doesn't seem to be a certainty based on the given information.

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Crista

11 months ago

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

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Audria

12 months ago

C) 40000 LOC have been delivered to system testing (against the 20000 LOC planned by the project manager)

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Delisa

12 months ago

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

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Sharen

1 year ago

A) The code for the new project contains a higher defect density than the code of the past projects

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Louvenia

1 year ago

Option D seems to be the most accurate statement. The higher number of defects found during system testing suggests a higher defect density compared to past projects.

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