A subset of PLANNER, implemented in Lisp by Gerald Sussman et al at MIT. Its important features weregoal-oriented, pattern-directed procedure invocation, anembedded knowledge base, and automatic backtracking.
microPLANNER was superseded by Conniver.
["microPLANNER Reference Manual", G.J. Sussman et al, AI Memo203, MIT AI Lab, 1970].