Three experiments assessed children's abilities to track behavioral, representational, and truth aspects of conventions. Three- and 4-year-olds recognized that conventional stipulations would change behavior, but not how stipulations might affect representations. Three- and 5-year-olds confused pretenses and conventions; 7-year-olds consistently judged that conventions, not pretenses, changed reality. Three- and 5-year-olds' performance on false-belief and "false-convention" tasks did not differ. (Author/KB)