Dendral program (Edward Feigenbaum, Joshua Lederberg, Bruce Buchanan, Georgia Sutherland at Stanford University) demonstrated to interpret mass spectra on organic chemical compounds.
First successful knowledge-based program for scientific reasoning.
This book is considered by some to mark the beginning of the AI winter of the 1970s, a failure of confidence and funding for AI.
Nevertheless, significant progress in the field continued (see below).
NOAH was applied at SRI International to interactively diagnose and repair electromechanical systems.
Barbara Grosz (SRI) established limits to traditional AI approaches to discourse modeling.
He referred to Kurt Gödel's result of 1931: sufficiently powerful formal systems are either inconsistent or allow for formulating true theorems unprovable by any theorem-proving AI deriving all provable theorems from the axioms.
Marvin Minsky and Seymour Papert publish Perceptrons, demonstrating previously unrecognized limits of this feed-forward two-layered structure.Terry Winograd's Ph D thesis (MIT) demonstrated the ability of computers to understand English sentences in a restricted world of children's blocks, in a coupling of his language understanding program, SHRDLU, with a robot arm that carried out instructions typed in English.