15mths infants begin to recognize themselves in the mirror and begin to prefer to look at pictures of themselves, refer to themselves by name and with personal pronouns, and sometimes to know their age and gender. By 2 yrs, most children have the rudiments of self-awareness. Awareness of self extends understanding of ownership. Preschoolers often define themselves in terms of observable characteristics like possessions, physical characteristics, preferences, and competencies. During elementary self concept begins to include emotions, social grous, and comparisons with peers: more likely to describe themselves in terms of family relationships. Adolescence- self concept includes attitudes, personality traits, beliefs, and future plans, is likely to include family and kinship. Adolescents self-concepts are more abstract, more psychological, and more future oriented than self-concepts in younger children. Diffusion and foreclosure are more common in early adolescence; moratorium and achievement are more common in late adolescence and young adulthood.