Marian Sigman and Ron Ruskin are the authors of Continuity and Change in the Social Competence of Children with Autism, Down Syndrome, and Developmental Delays, published by Wiley.

• Abstract. Background and Goals of This Study.Stability of Diagnosis and Intelligence.Nonverbal Communication, Play, and Language Skills.Social and Emotional Responsiveness.Peer Interactions in School.Correlates and Predictors of Peer Interactions in School.Summary and Discussion.References.Acknowledgments..Commentary.Methodological Issues in Cross-Syndrome Comparisons: Matching Procedures, Sensitivity (SE), and Specificity (SP) (Carolyn B. Mervis and Byron F. Robinson).Response to the Commentary by Mervis and Robinson (Marian Sigman).Contributors.

Marian Sigman and Ron Ruskin are the authors of Continuity and Change in the Social Competence of Children with Autism, Down Syndrome, and Developmental Delays, published by Wiley.

• Abstract. Background and Goals of This Study.Stability of Diagnosis and Intelligence.Nonverbal Communication, Play, and Language Skills.Social and Emotional Responsiveness.Peer Interactions in School.Correlates and Predictors of Peer Interactions in School.Summary and Discussion.References.Acknowledgments..Commentary.Methodological Issues in Cross-Syndrome Comparisons: Matching Procedures, Sensitivity (SE), and Specificity (SP) (Carolyn B. Mervis and Byron F. Robinson).Response to the Commentary by Mervis and Robinson (Marian Sigman).Contributors.

Marian Sigman and Ron Ruskin are the authors of Continuity and Change in the Social Competence of Children with Autism, Down Syndrome, and Developmental Delays, published by Wiley.

• Abstract. Background and Goals of This Study.Stability of Diagnosis and Intelligence.Nonverbal Communication, Play, and Language Skills.Social and Emotional Responsiveness.Peer Interactions in School.Correlates and Predictors of Peer Interactions in School.Summary and Discussion.References.Acknowledgments..Commentary.Methodological Issues in Cross-Syndrome Comparisons: Matching Procedures, Sensitivity (SE), and Specificity (SP) (Carolyn B. Mervis and Byron F. Robinson).Response to the Commentary by Mervis and Robinson (Marian Sigman).Contributors.