CTFL-AcT Exam Dumps : ISTQB Certified Tester - Acceptance Testing (CT-AcT)

ISO/IEC 25010 defines two key quality models:

Product Quality Model (e.g., Usability, Security, Portability)

Quality in Use Model — which includes characteristics of the user’s experience when interacting with the product in a real-world context.

The four main characteristics of the Quality in Use model are:

Effectiveness

Efficiency

Satisfaction

Freedom from risk

Option A — Efficiency is one of the key Quality in Use characteristics, as it refers to the resources used to achieve goals with accuracy and completeness.

Other options:

B (Usability), C (Compatibility), and D (Portability) are characteristics of the Product Quality Model, not of Quality in Use.

Therefore, the correct answer, as per ISO 25010:2011, is:

Answer: A. Efficiency

Performance testing assesses how a system behaves under specific conditions, typically focusing on responsiveness, stability, and resource usage. The type of performance test depends on the workload model:

Load testing evaluates performance under expected peak usage.

Stress testing pushes the system beyond its capacity to assess limits.

Endurance/stability testing checks for performance degradation over extended periods.

Option A correctly describes that performance test types are determined by the workload simulation strategy.

Other options:

B confuses performance with security testing — malicious attack robustness is a security focus, not performance.

C is partly correct but less comprehensive than A. While testing should simulate realistic conditions, categorization into stress/load/endurance is better aligned with workload modeling.

D is misleading — performance tests validate systems against performance requirements; they are not primarily used to define them.

Answer: A. Depending on the model used to simulate the workload, performance tests are called load, stress or endurance / stability tests.

Effective test reporting should be tailored to the audience’s role and needs. Project managers are typically concerned with high-level progress, schedules, risks, and milestones. Progress trend charts (e.g., test execution over time, defect trends) provide insights into how the project is advancing and help identify delays or bottlenecks.

Option B is correct as it fits the informational needs of a project manager.

Other options:

A: Defect reports are too detailed for steering groups, which prefer strategic summaries or risk reports.

C: Pie charts may provide high-level summaries, but development teams usually need detailed defect or test result data.

D: System users (e.g., customers) are not responsible for project risks and would not benefit from test risk rankings.

Answer: B. Progress trend charts for the project manager