Honestly, that was almost 40 years ago and the details escape me. I do remember that it was not a fine detail model. I think some ‘experts’ in my company wrote

Honestly, that was almost 40 years ago and the details escape me. I do remember that it was not a fine detail model. I think some ‘experts’ in my company wrote up how they solved certain problems and I tried to capture that. I might have used OPS5 in the Common Lisp prototype. I (in hindsight) wasted a lot of time back then on symbolic AI that didn’t scale, and not enough time with neural networks. I was on a DARPA neural network advisory panel in the mid 1980s and I had a few good wins using NNs.