During a review of a class diagram for a banking application, a reviewer finds that two classes have identical attributes and methods. The team suspects this is a modeling error rather than a deliberate design. What is the most likely defect and the appropriate correction?

The model is correct; identical classes are always acceptable in MBT.

The defect is in the requirements; update them to reflect the duplicate classes.

The defect is in the tool; reinstall the modeling software.

The model has redundancy; consolidate the duplicate classes or introduce an inheritance relationship if appropriate.

A safety-critical system's MBT model has been updated to reflect a new regulatory requirement. The team must prove to an auditor that every model element can be traced to a specific requirement. Which practice best supports this audit?

Keep a single document listing all requirements that were considered during modeling.

Store the model and requirements in separate repositories without cross-references.

Maintain a bidirectional traceability matrix linking each model element to its source requirement and vice versa.

Add comments in the model code describing the requirements in natural language.

A team uses an MBT tool that can generate test cases from the model. They have just fixed a defect in the model. They want to ensure the generated test cases still cover all requirements. What is the most efficient way to do this?

Re-run the tool's coverage analysis to check that all requirements are still covered by the generated tests.

Delete all generated tests and regenerate them from scratch.

Manually review every generated test case to ensure it is still valid.

Assume the fix does not affect coverage and skip the check.

A review team is examining a model and finds that two different requirements lead to contradictory behaviors in the same state. For example, one requirement says the system should 'retry connection' and another says it should 'fail immediately' on the same event. What is the most appropriate review outcome?

Choose the 'retry connection' behavior because it is more user-friendly.

Model both behaviors and let the system decide at runtime.

Remove both requirements from the scope.

Flag the contradiction as a requirements conflict and escalate to the product owner for resolution.

Certified Tester Model-Based Testing

Domain 2Objective 8

Iterative Model Development, Review and Validation CT-MBT Practice Questions (Page 5)

Part of the MBT Modeling domain, which makes up ~27% of our current practice bank. ISTQB does not publish an official question count, but from its 60-minute exam (~25–40 total, ~7–11 in this domain), expect 1–1 from this objective — we provide 27 practice questions to prepare you well beyond it. (estimate)

27questions here

6free pages

6concepts

Questions 21–25

21application · medium
During a review of a class diagram for a banking application, a reviewer finds that two classes have identical attributes and methods. The team suspects this is a modeling error rather than a deliberate design. What is the most likely defect and the appropriate correction?
Select an answer first
22application · medium
A safety-critical system's MBT model has been updated to reflect a new regulatory requirement. The team must prove to an auditor that every model element can be traced to a specific requirement. Which practice best supports this audit?
Select an answer first
23foundation · easy
Which validation method involves executing the MBT model to observe its behavior and compare it with expected system behavior?
Select an answer first
24expert · hard
A team uses an MBT tool that can generate test cases from the model. They have just fixed a defect in the model. They want to ensure the generated test cases still cover all requirements. What is the most efficient way to do this?
Select an answer first
25expert · hard
A review team is examining a model and finds that two different requirements lead to contradictory behaviors in the same state. For example, one requirement says the system should 'retry connection' and another says it should 'fail immediately' on the same event. What is the most appropriate review outcome?
Select an answer first

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Iterative Model Development, Review and Validation CT-MBT Practice Questions (Page 5)

Questions 21–25

During a review of a class diagram for a banking application, a reviewer finds that two classes have identical attributes and methods. The team suspects this is a modeling error rather than a deliberate design. What is the most likely defect and the appropriate correction?

A safety-critical system's MBT model has been updated to reflect a new regulatory requirement. The team must prove to an auditor that every model element can be traced to a specific requirement. Which practice best supports this audit?

Which validation method involves executing the MBT model to observe its behavior and compare it with expected system behavior?

A team uses an MBT tool that can generate test cases from the model. They have just fixed a defect in the model. They want to ensure the generated test cases still cover all requirements. What is the most efficient way to do this?

Keep studying — MBT Modeling