Rated emotional tone, attention span, activity, cooperation, and orientation to laboratory staff during a standardized sequence of interactions between 84 1-yr-old twins and the staff. Ss' behavior was videotaped and then rated for successive 2-min periods, after which the ratings were condensed into a composite temperament profile. A factor analysis revealed 3 principal dimensions, the primary one involving positive emotional tone, sustained attention, and receptiveness to the staff. The Toddler Temperament Scale was completed by parents for each twin. Scores revealed a strong 1st factor anchored on 4 categories of temperament: adaptability, approach, attention and persistence, and positive mood. A canonical analysis performed on the factor scores from the 2 data sets showed significant continuity in the expression of temperament between home and laboratory. Results demonstrate (1) that the infant's temperament profile can be reliably detected and rated and (2) convergent validity between laboratory ratings and parents' report.(39 ref)(PsycINFO Database Record (c) 2016 APA, all rights reserved)