ISTQB CTAL-TTA Exam - Topic 3 Question 35 Discussion

Actual exam question for ISTQB's CTAL-TTA exam

Question #: 35
Topic #: 3

A new reusable software component that handles sensor management has been developed. It will be used in manufacturing processes that work at SIL 2 and avionics systems where failure could lead to a "major" incident. The code contains no loops but does contain decisions with multiple conditions. Which of the following would be the BEST structure-based testing option for the new software?

AMC/DC coverage

BAPI coverage

CDecision coverage

DStatement coverage

Show Suggested Answer

Suggested Answer: A

Context of the Problem:

The software component handles sensor management.

It is used in manufacturing processes that work at SIL 2 and avionics systems.

Failure could lead to a 'major' incident.

The code contains decisions with multiple conditions and no loops.

Safety Integrity Level (SIL) 2:

SIL 2 indicates that the software must adhere to stringent safety standards.

Avionics systems also require high safety standards due to the potential consequences of failure.

Testing Options:

MC/DC (Modified Condition/Decision Coverage):

MC/DC is essential for high-integrity and safety-critical systems like avionics.

Ensures each condition in a decision has been shown to independently affect the outcome.

Required by standards such as DO-178C for avionics software at certain levels.

API Coverage:

Focuses on testing the interfaces between components.

Important but not sufficient alone for high-integrity, safety-critical systems.

Decision Coverage:

Ensures that each decision point (i.e., if statements) is evaluated as both true and false.

Less comprehensive than MC/DC for safety-critical applications.

Statement Coverage:

Ensures that each statement in the code has been executed at least once.

Basic level of coverage, insufficient for safety-critical systems like those at SIL 2.

Best Option:

Given the high safety requirements (SIL 2, major incident potential), MC/DC coverage is the best option. It provides a thorough level of testing needed to meet safety standards.

by Sabra at May 02, 2025, 02:13 AM

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Cristal

7 months ago

Totally agree, MC/DC is essential for those multiple conditions!

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Arleen

7 months ago

I think decision coverage could work too, but not as thorough.

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Cyndy

7 months ago

Statement coverage won't cut it for safety-critical systems.

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Dorothea

7 months ago

Surprised they didn't mention path coverage! Seems important.

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Pilar

8 months ago

MC/DC coverage is definitely the way to go for this.

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Elina

8 months ago

I feel like API coverage is more about testing the interface rather than the internal logic, so it might not be the best choice here.

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Starr

8 months ago

I practiced a similar question where we had to choose between different coverage types, and I think statement coverage was the least effective for complex decisions.

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Launa

8 months ago

I'm not entirely sure, but I think decision coverage might be sufficient since it covers multiple conditions, right?

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Lezlie

9 months ago

I remember studying that MC/DC coverage is really important for systems where failure can lead to major incidents, especially in avionics.

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Germaine

9 months ago

I'm leaning towards MC/DC coverage. With the safety-critical nature of the application and the complex decision logic, that seems like the most thorough and appropriate testing approach.

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Jeffrey

9 months ago

Hmm, I'm not sure. API coverage could be a good option too, since we need to ensure the sensor management component is working properly with the rest of the system.

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Golda

9 months ago

Okay, let's see. The code has no loops but does have multiple conditions in the decisions. That sounds like MC/DC coverage might be the best approach here.

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Chi

9 months ago

This seems like a tricky one. I'll need to think carefully about the different testing options and how they apply to the given scenario.

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Julianna

1 year ago

I'm just glad I don't have to write this code. Choosing the right testing strategy is like playing chess with a blindfold on.

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Sarah

1 year ago

API coverage? What is this, a web app? This is hardcore embedded stuff, folks. MC/DC is the only way to fly!

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Alba

1 year ago

API coverage is more suitable for web applications, not for embedded systems like this.

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Alba

1 year ago

MC/DC coverage is definitely the way to go for this type of software.

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Helene

1 year ago

I believe MC/DC coverage is the best option because it ensures every decision in the code is tested independently.

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Matt

1 year ago

Hmm, I'm not so sure. Statement coverage might be the simplest, but it won't give you the full picture. Tough call!

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Felicidad

1 year ago

A: Yeah, statement coverage might miss some important conditions in the code.

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Kayleigh

1 year ago

B: I agree, MC/DC coverage is more thorough than statement coverage.

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Josphine

1 year ago

A: I think MC/DC coverage would be the best option for this software.

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Harley

1 year ago

I'm not sure, I think Decision coverage could also be a good choice.

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Jolanda

1 year ago

I'd say Decision coverage is the better choice here. Covering all the possible combinations of those multiple conditions is crucial.

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Luis

1 year ago

MC/DC coverage is definitely the way to go for this type of mission-critical software. Gotta make sure those decision points are rock solid!

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Cassi

1 year ago

Statement coverage may not be sufficient for this software, we need to ensure every decision is thoroughly tested.

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Melvin

1 year ago

I agree, decision coverage is essential for testing software with multiple conditions.

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Kimbery

1 year ago

MC/DC coverage is crucial for ensuring the reliability of the software in critical systems.

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Gearldine

1 year ago

I agree with Kandis, MC/DC coverage is the most thorough option.

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Kandis

1 year ago

I think the best option would be MC/DC coverage.

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