According to the BABOK® Guide, one of the elements of the conduct elicitation activity is tracking the time actually spent eliciting the requirements. This element helps to provide a basis for future planning by comparing the actual time spent with the planned time, identifying the variances, and analyzing the causes and impacts of the variances. Tracking the time actually spent eliciting the requirements also helps to monitor the progress and performance of the elicitation activities, evaluate the effectiveness and efficiency of the elicitation techniques, and improve the estimation and scheduling of future elicitation activities. The other options are not elements of the conduct elicitation activity, although they may be related to it. The number of stakeholders that did not participate in the requirements elicitation is an element of the confirm elicitation results activity, which helps to ensure the completeness and accuracy of the elicitation outcomes. The cost of actually eliciting the requirements is an element of the manage requirements traceability activity, which helps to track the relationships and dependencies among the requirements and other project deliverables. The changes that entered the scope throughout the requirements elicitation activities are an element of the maintain requirements activity, which helps to manage the changes and updates to the requirements throughout the project life cycle. References:

BABOK® Guide v3, section 4.2, page 108-109

Conducting elicitation activity – The Functional BA, paragraph 1

Prepare for Elicitation, paragraph 2

Elicitation and Facilitation—Tools, Tips, and Techniques, paragraph 2