Collect benchmark data points from business experts Perhaps the person who was responsible for the previous version of areport youre replacing Someone who knows the subject and the data Someone who knows how it was done Collect data points at the lowest grain Most specific Example: Sales_Qty, Sales_Amt of Product 1059 on 8/1/2007 at Store 21 byEmployee 99 and at various levels of aggregation Increasingly more summarized Across all dimensions involved in the report Example: Sales_Qty, Sales_Amt of all Products on 8/1/2007 at Store 21 byall employeesCollect Symptom Some values too high, others may be correct When too high, its by an even multiple of the correct value This suggests a SQL (fan/chasm) trap in the universe ID the offending object(s) by systematically pulling objects out of the queryuntil the values are correct Share findings with your universe designer so they can fix