Once a child "knows" that he is male or she is female (that is, knowing that gender is eternal), the child will want to do something consistent with his "category". Kohlberg believes that it is natural to attach importance to being consistent with one's own "category" or doing things commensurate with oneself, so children often imitate the behavior of people like themselves (girls are mothers or sisters, boys are fathers or brothers). Kohlberg also believes that children will imitate the behavior of those who are respected for their prestige or power, and because men often have these qualities, girls may be influenced by both men and women and imitate them. Kohlberg went on to say that girls can't imitate each other like boys, so their so-called femininity is defined by men's acceptance and recognition. Kohlberg believes that biology and environment are the factors that affect the development of gender identity. For Kohlberg, once a child realizes "I am a boy" or "I am a girl", he will want to do something for the boy or girl, and he will feel that it is beneficial to do so. The most important aspect of this theory is to pay attention to the child's thoughts on gender and his or her understanding of this knowledge.