What if the other party does not behave honorably?

That can happen. It also can and does happen in conventional legal representation. What's different about collaborative law is that the collaborative agreement requires a lawyer to withdraw if his/her client is being less than fully honest, or participating in the full good faith. For instance, if documents are altered or withheld, or if a client is deliberately delaying matters for economic or other gain, the lawyers have promised in advance that they will withdraw and will not continue to represent the client. The same is true if the client fails to keep agreements made during the course of negotiations. The other party then has 30 days to find a new lawyer and the parties proceed via the court system.