1. A comparative analysis system for providing comparative analysis of business intelligence data represented by a multi-dimensional model, the comparative analysis system comprising: a definition manager for independently managing definition of dimensional members of a data source; an operation manager for allowing a user to define a set of dimensional members of interest and at least one operator to manipulate the defined set of members based on the selected operator; and a display manager for managing placement of the defined set of members in a report so that the defined set of members are displayed adjacently based on the operator to facilitate comparative analysis.