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J. Anderson, Acquisition of Cognitive Skill. {\em Psychological Review}, 89, 1982.

Author of the summary: J. William Murdock, 1997, murdock@cc.gatech.edu

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Keywords: Production System, Knowledge Compilation

System: ACT

Summary: Introduces a theory of learning divided into three stages:
cognitive (declarative), associative (transitional), and autonomous
(procedural).  Introduces production systems in general and ACT in
particular, using an example.  Describes key features of ACT: goals,
conflict resolution (based on specificity, strength, prohibition of
repetition, etc.), and variablized slots.  Describes the declarative
stage using geometric proofs as an example (arguing that the
procedural knowledge needed for novice performance is simply not
available).  Discusses the knowledge compilation process as involving
two mechanisms: composition of productions into "macroproductions",
and proceduralization or the replacement of variables in generalized
productions with specific data in specialized ones.  Compares the ACT
knowledge compilation mechanisms with known psychological results.
Describes additional learning that takes place in the final
(procedural) stage: generalization, discrimination
(i.e. specialization), and adjusting strengths.  Provides more
psychological evidence and analysis, including a description of ACT's
modeling of the power law of learning.  

Summary author's notes:

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