Which of the following elicitation techniques is BEST usedwhen questioning a large number of stakeholders...

Quantitative questionnaires are best suited for eliciting non-functional requirements from a large number of stakeholders. This is because they allow for the collection of measurable, statistical data that can be analyzed to understand the stakeholders’ needs regarding system qualities like performance, usability, and reliability. These questionnaires can be designed to include specific questions about non-functional aspects, which can then be quantitatively assessed to inform the acceptance criteria1.

References = The ISTQB Advanced Level Agile Technical Tester syllabus and study resources emphasize the importance of understanding and defining both functional and non-functional requirements in Agile environments. They outline various elicitation techniques that can be used to gather these requirements, including the use of questionnaires for collecting quantitative data23.