A Japanese edition of new self-report scale of children's perceptions of control, previously developed by Connell (1985), is described here. Perceptions of control are defined as children's understanding of the locus being sufficient causes for successful or unsuccessful outcomes. 3 dimensions of fourth- through sixth-grade children's perceptions of control are independently assessed: internal, powerful others, and unknown. Each of these sources of control is assessed within 3 behavioral domains: cognitive, social, and physical. General items are also included. Perceptions of control over both successful and unsuccessful outcomes are assessed separately. The psychometric properties of the new scale are presented. Correlations of the new scale with measures of perceived competence and hopelessness are reported. It is argued that the new scale is a progress over existing scales of internal versus external locus of control in children because it provides domain-specific assessments of 3 separate dimensions of locus of control, including the previously untapped dimension of unknown control.