Getting a dynamic Sample - response (2) by smull

Hi Dieter....thanks for the reply. The number of CommunicationIds will not be known. It too will vary each evening. What I mean by Max and Min is: if there are only say 10 customers for one communication then I may not want to extract 10% (as the number of customers selected is so small). I would like to select a % between a Min and a Maximum ie select 10% but no less than 10 and no more than 100....unsure how to go about doing this...