This function would allow you to lookup a value from another data source with a value that is in your current data source. It would return the first matching value for the specified name from a data source that contains name/value pairs. This would allow the porting of many SSRS reports over to Telerik Reporting. Example: I have a report which lists all sales staff in our firm, with other personal information. We have a multi-dimensional data source (Cube) where we have all the financial data stored and calculated. If I wanted to retrieve the total sales and total revenue that each member of the sales staff had, it would require me to use a sub-report to load the data (using a parameter to pass the staff member's unique ID). This causes the loading/generating of the report to take longer, as the query against the Cube has to happen for each member of the sales staff, because of the use of a sub-report. With this new LOOKUP() function, it would allow the data source to be loaded and the report would be able to lookup the sales and revenue values for each staff member ID.