Hi, here I am again! I want to use recursion to do something like follows: 1- slice the problem in small parts 2- optimize each small part with SAS OR 3- if the result matches some conditions, the answer is accepted, otherwise, this small part goes to a secondary list 4- after running all small parts in the first step, the eventual secundary list of small parts are put together and sliced again in small parts using a different criteria. 5- return to point 2, but this time the step 3 criterias are different I need to run this loop 9 times, each time with different criterias. The question is: I never worked with SAS in a recursive way, it was always a 1 shot run. How do I need to structure the loop? Macros? Thanks a Lot! Marcos ... View more