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Journal of Applied Behavior Analysis, v40 n3 p475-488 Fall 2007

The purpose of this study was to examine the use of percentile schedules as a method of quantifying the shaping procedure in an educational setting. We compared duration of task engagement during baseline measurements for 4 students to duration of task engagement during a percentile schedule. As a secondary purpose, we examined the influence on shaping of manipulations of the number of observations used to determine the criterion for reinforcement (the m parameter of the percentile formula). Results showed that the percentile formula was most effective when a relatively large m value (20 observations) was used. (Contains 2 tables and 2 figures.)

Descriptors: Functional Behavioral Assessment, Referral, Intervention, Behavior Problems, Children, Behavior Modification, Time on Task, School Schedules, Psychometrics, Interaction Process Analysis, Naturalistic Observation

Society for the Experimental Analysis of Behavior. Available from: Department of Applied Behavioral Science. Kansas University, 1000 Sunnyside Avenue, Lawrence, KS 66045-2133. Tel: 785-841-4425; Fax: 785-841-4425; e-mail: behavior[at]; Web site:

Autor: Athens, Elizabeth S.; Vollmer, Timothy R.; St. Peter Pipkin, Claire C.


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