Before launching a dimensional modeling effort, the team needs to understand the needs of the business, as well as the realities of the underlying source data. You uncover the requirements via sessions with business representatives to understand their objectives based on key performance indicators, compelling business issues, decision-making processes, and supporting analytic needs. At the same time, data realities are uncovered by meeting with source system experts and doing high-level data proļ¬ling to assess data feasibilities.