To define the report,user must decide,Which characteristics should appear in the report? A characteristic can only be used once in a report,in report rows, report columns, or data selection criteria. Use the Layout variation to establish how values are displayed in the reports. Each report has five variations available for this purpose. A single variation establishes column width, the column number for the value's unit, and the number of decimal places and exponents for the report output.user can only perform arithmetic calculations within a column block.