Primary Classification:
  E. Data
  E.1 DATA STRUCTURES
      Subjects: Lists, stacks, and queues

Additional Classification:
  F. Theory of Computation
  F.1 COMPUTATION BY ABSTRACT DEVICES
      F.1.1 Models of Computation
          Subjects: Bounded-action devices (e.g., Turing machines, random access machines)

  I. Computing Methodologies
  I.2 ARTIFICIAL INTELLIGENCE
      I.2.7 Natural Language Processing
          Subjects: Speech recognition and synthesis
      I.2.8 Problem Solving, Control Methods, and Search
          Subjects: Graph and tree search strategies

  K. Computing Milieux
  K.2 HISTORY OF COMPUTING
      Subjects: Systems

General Terms:
Design, Theory

Keywords:
LISP, Turing, artificial intelligence, cognition, computer science, empirical, heuristics, integer programming, intelligence, list processing, problem solving, science, search, symbols