Early intervention (EI) and early childhood special education (ECSE) practitioners participating in the Child Outcomes Summary (COS) process must understand age-expected development, the ages at which children typically acquire different skills. This resource provides answers to commonly asked questions about age anchoring as it applies to the COS…

Determining which dimensions of social classification are culturally significant is a developmental challenge. Some suggest this is accomplished by differentially privileging intrinsic visual cues over nonintrinsic cues (Atran, 1990; Gil-White, 2001), whereas others point to the role of noun labels as more general promoters of kind-based reasoning…

Self-Knowledge Development Theory (SKDT) by Weinstein and A. Alschuler (1985) is a structural developmental theory positing four stages in the development of self-knowledge. The Experience Recall Test-2 (ERT2) is described, which is the most recent instrument developed for assessing the SKDT. Self-knowledge is defined as the ability to describe…

Matrix tasks designed to assess the logical properties of multiple classification and multiple seriation were administered to 105 first, third, and fifth grade children. The tasks included cross-class and double series matrices, each of which had a reproduction and a transposition instructional set, and a revised set of cross-class and double…