Hi, I'm trying to use drools to do grouping of data according to patterns defined in my rules, but I'm having issues creating something that works in a reasonable amount of time (seconds). I've tried all sorts of permutations without much luck and would like to hear how others would do the same thing. To give an example: I've got a big batch of transaction records and I want to aggregate all the records where the consumer id and product category are the same and the purchases were made within an hour of each other. The fact that its matching the same values between facts, rather than against constants seems to scupper it somewhat. I would go down the ETL route, but the idea is for non-techies to define their own aggregations using rules. -Cheers. Tim