The primary purpose of this study was to assess the test-retest reliability of the Junior Self-Monitoring Scale (JSMS) for use with elementary school children. Subjects were 28 first, 30 third, and 24 fifth graders attending an elementary school in Corvallis (Oregon). The JSMS consists of 24 yes/no items and is scored in the direction of high self-monitoring. Individual items reflect the domains of self-monitoring developed by M. Snyder (1979). These domains include concern for social appropriateness, attention to social cues indicating appropriate self-presentation, control over one's self-presentation and self-expression, strategic use of these abilities, and situational specificity of self-presentation and expressive behavior. Subjects' levels of introversion-extraversion, neuroticism, and psychoticism were assessed via the Eysenck Personality Inventory after administration of the JSMS. Results indicate that the JSMS is a reliable measure that can be used to assess self-monitoring in grade-school children. Used in conjunction with its adult counterpart, the JSMS can help determine the relationships between children's self-monitoring orientations and those of parents of siblings. The JSMS is appended, and four tables conclude the document. (TJH)