This document provides an introduction to assertiveness. It defines assertiveness as communicating one's needs, feelings, opinions and beliefs in an open and honest manner without violating others' rights. It discusses how assertiveness originated from civil rights and women's movements. The document contrasts assertiveness with aggression, which denies others' rights, and non-assertion, which denies one's own rights. It asserts that assertiveness simultaneously acknowledges both one's own rights and the rights of others.