The empirical case in which Israel and the PLO negotiated and successfully concluded the Declaration of Principles (DOP) puts into focus many of the issues of public vs. secret diplomacy. There were many tracks of negotiation in this case; two important ones are analyzed here: (1) the official negotiations in Washington, and (2) the secret back-channel negotiations in Oslo. Moreover, the two tracks were pursued simultaneously, and it is therefore interesting to consider the interactions between them.