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    A gender role is a set of societal norms dictating what types of behaviors are generally considered acceptable, appropriate or desirable for a person based on their actual or perceived sex.

   Gender typing is the process by which a child becomes aware of their gender and thus behaves accordingly by adopting values and attributes of members of the sex that they identify as their own.

   Gender identity is defined as a personal conception of oneself as male or female (or rarely, both or neither). This concept is intimately related to the concept of gender role, which is defined as the outward manifestations of personality that reflect the gender identity.

   "The concept of gender constancy, influenced by the cognitive development theory of Jean Piaget, was introduced by Lawrence Kohlberg (1927-1987). Addressing the formation of gender identity in terms of cognitive development, Kohlberg advanced the idea that the development of sex roles depends in large part on a child's understanding that gender remains constant throughout a person's lifetime. Children realize that they are male or female and are aware of the gender of others by the age of three. However, at these ages they still do not understand that people cannot change genders the way they can change their clothes, names, or behavior. Kohlberg theorized that children do not learn to behave in gender-appropriate ways until they understand that gender is permanent, which occurs at about the age of seven. At this point they start modeling the behavior of members of their own sex." Read more: Gender Constancy - Sex Roles, Lawrence Kohlberg, and Concept Formation - JRank Articles http://psychology.jrank.org/pages/272/Gender-Constancy.html#ixzz403L3pG6X