
The development of behavior modification principles and procedures and the ensuing research have had a dramatic impact on services for mentally re- tarded persons. This book is the second edition of a volume that is designed to update readers on some of these many developments...


The development of behavior modification principles and procedures and the ensuing research have had a dramatic impact on services for mentally re- tarded persons. This book is the second edition of a volume that is designed to update readers on some of these many developments...