This issue of International Negotiation examines how negotiation theory can be used to understand the development of people's identity, especially their political identity. All of the articles in the issue involve ``negotiation'' if it is defined broadly as a process aimed at reconciling conflicting desires or viewpoints. The development of group (collective) identity and individual political identity is explored, and the contribution of negotiation theory to understanding identity development is investigated. Overall, these articles present a challenge to negotiation theory: to develop itself in directions that will be useful for understanding how identities are negotiated. Crucial gaps in this theory are considered.