Explanation
A focus group is a technique that helps to elicit the opinions, preferences, and feedback of a group of stakeholders about a specific topic, such as a prototype of a new web-based application. A focus group is facilitated by a moderator who guides the discussion and encourages the participants to share their views and experiences. A focus group can help the BA to understand the stakeholders' perception, ideas, and attitudes about the prototypes, and to identify any issues, gaps, or improvements. A decision analysis is a technique that helps to evaluate and compare the possible outcomes of different alternatives using criteria such as costs, benefits, risks, and impacts. A decision analysis can help the BA to select the best solution option, but it does not elicit the stakeholders' perception, ideas, and attitudes about the prototypes. A prioritization is a technique that helps to rank the requirements or solution options based on their relative importance, urgency, value, or dependency. A prioritization can help the BA to determine the optimal scope and sequence of the solution delivery, but it does not elicit the stakeholders' perception, ideas, and attitudes about the prototypes. A brainstorming is a technique that helps to generate a large number of ideas or solutions in a short time by encouraging the participants to think creatively and freely. A brainstorming can help the BA to explore different possibilities and perspectives, but it does not elicit the stakeholders' perception, ideas, and attitudes about the prototypes. References: BABOK Guide v3, Chapter 10: Techniques, Section 10.24: Focus Groups, p. 532-533; Section 10.16: Decision Analysis, p. 518-520; Section 10.38: Prioritization, p. 550-552; Section
10.7: Brainstorming, p. 503-504.