Most model write-ups show you the answer. Very few show you how the thing decided, which is the part I actually need when a script makes a call I disagree with. I have been collecting notes on two runtimes that put the decision in the output: Jev (TypeSafe System One) and Laya , an open decision model you can run on your own machine. The short version of both lives at jev001.org , and the parts I keep coming back to are below. The output is a decision, not a paragraph A ty...