The true statements about workshops are b and c. Workshops are collaborative, structured meetings involving multiple stakeholders. Statement (b) is true because having multiple stakeholders present allows the facilitator (often the BA) to immediately cross-check and resolve conflicting information or assumptions in real-time. Statement (c) is true because the group environment, led by a skilled facilitator, is highly effective for discussing differing viewpoints and working towards a consensus or agreed-upon outcome. Statement (a) is false as this describes formal observation, not a workshop. Statement (d) is false; workshops are primarily used to gather qualitative information (opinions, requirements, process logic), not to collect accurate quantitative data (e.g., process timings or volumes), which is usually obtained from documents or system logs.

(Reference: BCS Foundation Certificate in Business Analysis / BCS Business Analysis Practice – Investigative Techniques, Workshops)