Abstract

A framework for skill acquisition is proposed that includes two major stages in the development of a cognitive skill: a declarative stage in which facts about the skill domain are interpreted and a procedural stage in which the domain knowledge is directly embodied in procedures for performing the skill. This general framework has been instantiated in the ACT system in which facts are encoded in a propositional network and procedures are encoded as productions. Knowledge compilation is the process by which the skill transits from the declarative stage to the procedural stage. It consists of the subprocesses of composition, which collapses sequences of productions into single productions, and proceduralization, which embeds factual knowledge into productions. Once proceduralized, further learning processes operate on the skill to make the productions more selective in their range of applications. These processes include generalization, discrimination, and strengthening of productions. Comparisons are made to similar concepts from past learning theories. How these learning mechanisms apply to produce the power law speedup in processing time with practice is discussed. It requires at least 100 hours of learning and practice to acquire any significant cognitive skill to a reasonable degree of proficiency. For instance, after 100 hours a student learning to program a computer has achieved only a very modest facility in the skill. Learning one's primary language takes tens of thousands of hours. The psychology of human learning has been very thin in ideas about what happens to skills under the impact of this amount of learning—and for obvious reasons. This article presents a theory about the changes in the nature of a skill over such large time scales and about the basic learning processes that are responsible.

Citations

312	M.M.: Context theory of classification learning - Medin, Schaffer - 1978
191	Controlled and automatic human information processing - Schneider, Shiffrin - 1977
141	Plans and the structure of behavior - Miller, Galanter, et al. - 1960
141	Mechanisms of skill acquisition and the law of practice - Newell, Rosenbloom - 1981
97	A first language - Brown - 1973
97	Expert and novice performance in solving physics problems - Larkin, McDermott, et al. - 1980
79	Fundamentals of skill - Welford - 1968
61	Repair theory: A generative theory of bugs in procedural skills - Brown, Vanlehn - 1980
44	The internal language of children's syntax: The ontogenesis and representation of syntactic categories - Maratsos, Chalkley - 1980
32	Knowledge compilation: Mechanisms for the automatization of cognitive skills - Neves, Anderson - 1981
28	Memory scanning: mental processes revealed by reaction time experiments. Am Sci - Sternberg - 1969
28	Hayes-Roth (Eds.), Pattern-directed inference systems - Waterman, F - 1978
26	The development of automatism - Shiffrin, Dumais
14	On learning the grammatical order of words - Braine - 1963
14	Learning and stability - Snoddy
13	A general learning theory and its application to schema abstraction - Anderson, Kline, et al. - 1979
12	Manufacturing progress functions - Hirsch
11	Abstraction of visual patterns - Franks, Bransford - 1971
8	The central role of learning in cognition - Langley, Simon - 1981
7	A theory of language acquisition based on general learning mechanisms - Anderson - 1981
7	Memorial consequences of automatized encoding - Kolers
7	Inductive Inference of VL Decision Rules - Michatski, Larson
6	On the reduction of choice reaction times with practice - Mowbray, Rhoades
6	Searching for ten targets simultaneously. Perceptual and Motor Skills - Neisser, Novick, et al. - 1963
4	Memory retrieval and central comparison times in information processing - GE, Blaha - 1969
4	An instructible production system: Basic design issues - Rychener, Newell - 1978
3	The psychology of learning and motivation (Vol - Bower - 1979
3	A component model for stimulus variables in discrimination learning - BURKE, ESTES - 1957
3	C.: Possible synaptic mechanisms subserving learning - Eccles
3	Categories of human learning - Melton - 1964
3	OPS: A Domain-Independent Production System - Forgy, McDermott - 1977
3	Learning structured patterns from examples - Hayes-Roth, McDermott - 1976
3	Attention in learning - Trabasso, Bower - 1968
2	Complex learning processes - Anderson, Kline, et al. - 1980
2	Stimulus generalization - Heinemann - 1975
2	From discrimination learning to cognitive development: A neobehavioristic odyssey - Kendler, Kendler - 1975
2	Mechanization in problem solving. Psychological Monographs 54, whole issue - Luchins - 1942
2	On theories of language acquisition - McNeill - 1968
2	Stimulus selection in associative learning - Rudy, Wagner - 1975
1	Cognitive psychology and its implications - Hillsdale - 1976
1	Concept learning by feature value interval abstraction - Brown - 1977
1	Experimental Psychology: Human Learning and Memory - Estes - 1981
1	The state of the field: General problems and issues of theory and metatheory - Review - 1950
1	Concept learning and the recognition and classification of exemplars - Review - 1976
1	From classical conditioning to discrimination learning - MacKintosh - 1975
1	Theories of discrimination learning and learning set - Medin - 1976
1	Attention and performance VIII - Nickerson - 1980
1	Klatzsky (Eds.), Semantic factors in cognition - Cotton, R - 1978
1	Continuous versus noncontinuous interpretations of discrimination learning - Spence
1	Memory storage dynamics - Wickelgren - 1976