Personality types of 6-year-olds and their associations with academic achievement and behavior -- Replication with 5-year-olds of types and their associations with achievement and behavior -- Personality types and academic achievement -- Stability and change in personality types -- Personality type as a moderator of the association of head start participation to developmental outcome -- Summary of findings and general discussion -- Appendix A: Correlations among vectors of factor scores for seven random samples of 6-year-olds -- Appendix B: Correlations among vectors of factor scores for seven random samples of 5-year-olds -- Commentary: Setting an agenda for a person-centered approach to personality development / Richard W. Robins and Jessica L. Tracy.