Can someone please explain this? I'm guessing I don't understand order of execution. When perusing >>fibonacciSequence, I get a proper result, but I don't understand why when looking at the code. Consider this fragment... prevTotal := 0. currTotal := 1. currTotal := prevTotal + (prevTotal := currTotal). My understanding *was* that parentheses are executed first. (prevTotal := currTotal) - assigns and returns 1 currTotal := prevTotal + (1) and since prevTotal = 1 currTotal := 1 + (1) prevTotal = 1. currTotal = 2. Yet what appears to be happening is... prevTotal = 0 currTotal := 0 + (prevTotal := currTotal) then the parentheses... currTotal := 0 + (1) prevTotal = 1. currTotal = 1. Care to school me? Thanks! Russ -- Russ Whaley whaley.russ@gmail.com