Which method should the BA use to start collecting data?

Universal Containers just rolled out a new sales methodology and process. A month after the initial training, the manager has noticed some reps have a large number of overdue tasks. The manager is unsure if it’s a learning curve or a system issue and has asked the business analyst (BA) to determine the cause and recommend a solution.

Which method should the BA use to start collecting data?
A . Brainstorming and prototyping
B. Observation and interviewing
C. focus groups and workshops

Answer: B