Noting that reliable and valid measures of competence are essential for preschool screening, diagnostic, and research purposes, this review for practitioners and researchers presents an inventory and evaluation of standardized measuring instruments designed for assessing social and emotional competence in preschool children. A total of 39 instruments, presented in alphabetical order, are reviewed. Instrument types include Q-sort, behavioral checklists, and interview ratings. Each instrument is described in terms of: (1) background information (including type of instrument and target population); (2) scoring format; (3) evaluative information (normative data, reliability, validity, and other considerations); and (4) summary comments. The most recent addresses for information about the instrument are also presented. An overview of theoretical and methodological issues relating to the measures is included. Contains 138 references. (WP)