With 21 new articles and significantly revised and expanded introductory material, this third edition is intended to assist students and professionals alike in increasing their mastery of the range of methodological approaches available with which to examine clinical issues and phenomena.

"Includes 21 new articles"--Jacket.

Methodology : what it is and why it is so important / Alan E. Kazdin -- Unified psychology / Robert J. Sternberg and Elena L. Grigorenko -- Getting out of our conceptual ruts : strategies for expanding conceptual frameworks / Allan W. Wicker -- Toward terminological, conceptual, and statistical clarity in the study of mediators and moderators : examples from the child-clinical and pediatric psychology literatures / Grayson N. Holmbeck -- In defense of external invalidity / Douglas G. Mook -- When small effects are impressive / Deborah A. Prentice and Dale T. Miller -- Random sampling, randomization, and equivalence of contrasted groups in psychotherapy outcome research / Louis M. Hsu -- Stimulus sampling in clinical research : representative design reviewed / Brendan A. Maher -- Science, ethnicity, and bias : where have we gone wrong? / Stanley Sue -- Ethnic representation in a sample of the literature of applied psychology / Leslie Case and Timothy B. Smith -- Constructing validity : basic issues in objective scale development / Lee Anna Clark and David Watson -- Clinical applications of analogue behavioral observation : dimensions of psychometric evaluation / Stephen N. Haynes -- Psychological testing and psychological assessment : a review of evidence and issues / Gregory J. Meyer [and others] -- Methodological issues in assessment research with ethnic minorities / Sumie Okazaki and Stanley Sue -- On the origins of the .05 level of statistical significance / Michael Cowles and Caroline Davis -- Hypothesis validity of clinical research / Bruce E. Wampold, Betsy Davis, and Roland H. Good, III -- Things I have learned (so far) ; A power primer / Jacob Cohen -- Statistical significance testing and cumulative knowledge in psychology : implications for training of researchers / Frank L. Schmidt -- One cheer for null hypothesis significance testing / Howard Wainer -- The proof of the pudding : an illustration of the relative strengths of null hypothesis, meta-analysis, and Bayesian analysis / George S. Howard, Scott E. Maxwell, and Kevin J. Fleming -- Research on psychotherapy efficacy and effectiveness : between Scylla and Charybdis? / Peter E. Nathan, Scott P. Stuart, and Sara L. Dolan -- Are results of randomized controlled trials useful to psychotherapists? / Jacqueline B. Persons and George Silberschatz -- Improving the transition from basic efficacy research to effectiveness studies : methodological issues and procedures / Gregory N. Clarke -- The role of method in treatment effectiveness research : evidence from meta-analysis / David B. Wilson and Mark W. Lipsey -- Outcome assessment : from conceptualization to implementation / Michael J. Lambert [and others] -- Single-participant research design : bringing science to managed care / David L. Morgan and Robin K. Morgan -- Drawing valid inferences from case studies / Alan E. Kazdin -- Efficacy and specific effects data on new treatments : a case study strategy with mixed anxiety-depression / Karla Moras, Leslie A. Telfer, and David H. Barlow -- Clinical significance : measuring whether interventions make a difference / Alan E. Kazdin -- Toward the incorporation of costs, cost-effectiveness analysis, and cost-benefit analysis into clinical research / Brian T. Yates -- Ethical principles of psychologists and code of conduct / American Psychological Association -- Moral foundations in research with human participants / M/ Brewster Smith -- Ethical transgressions of psychology graduate students : critical incidents with implications for training / Barbara J. Fly [and others] -- Reflections on determining authorship credit and authorship order on faculty-student collaborations / Mark A. Fine and Lawrence A. Kurdek -- Statistical methods in psychology journals : guidelines and explanations / Leland Wilkinson and the Task Force on Statistical Inference -- Preparing and evaluating research reports / Alan E. Kazdin -- Writing a review article for Psychological bulletin / Daryl J. Bern -- Methodology : general lessons to guide research / Alan E. Kazdin.