The Motivation and Engagement Scale-University/College (MES-UC) was used to identify student typologies on the basis of adaptive and maladaptive academic cognitions and behaviours. The sample comprised first-year (n = 390), second-year (n = 300), and third-year (n = 251) undergraduate students with 4 student typologies identified: high…

Cluster analysis on factor analytic symptom profiles obtained from the Achenbach Child Behavior Checklist for 204 three- to five-year-old boys including 79 autistic and autistic-like children identified an autistic group as soon as three clusters were formed. This autistic cluster was later subdivided according to presence/absence of anxiety and…

Cluster analysis was performed on the adaptive behavior scores of 2 samples of 200 institutionalized mentally retarded individuals. Three clusters were found to be stable across clustering methods, subject samples, and time points 3 years apart. Cluster membership was meaningfully associated with demographic characteristics and neurological and…

Four papers offer comments on A. Silverstein's paper on cluster analysis of institutionalized mentally retarded individuals, and Silverstein responds to the commentaries. The commentaries examine the soundness of study goals, usefulness of an adaptive behavior classification system, and feasibility of utilizing adaptive behavior measures to…