Volume 13, Number 1, 2005 Contents: Preface. P. Wolfe, J.T. Neisworth, Autism and Applied Behavior Analysis. ARTICLES:G.L. Shook, J.T. Neisworth, Ensuring Appropriate Qualifications for Applied Behavior Analyst Professionals: The Behavior Analyst Certification Board. M. Wolery, E.E. Barton, J.F. Hine, Evolution of Applied Behavior Analysis in the Treatment of Individuals With Autism. B.A. Iwata, A.S. Worsdell, Implications of Functional Analysis Methodology for the Design of Intervention Programs. R.M. Kubina, Jr., P. Wolfe, Potential Applications of Behavioral Fluency for Students With Autism. P.L. Neidert, B.A. Iwata, C.L. Dozier, Treatment of Multiply Controlled Problem Behavior With Procedural Variations of Differential Reinforcement. V. Tucci, D. Hursh, R. Laitinen, A. Lambe, Competent Learner Model for Individuals With Autism/PDD.