As you begin to consider putting together a joint venture, you need to sit down together and consider all the different eventualities that can occur. You need to establish your goals and mission statement and put them down in writing. You will also need to list the responsibilities of each of the members of the venture as well so that there can be no mistake in who is responsible for every facet of the day to day operations, at the same time should anything go wrong it can help decide on whose shoulders any blame may fall.
Since the possibility of disputes is always present your agreement must include a place to cover how any disputes will be handled. This way everyone has already agreed to how these disputes are to be taken care of and cannot argue the point and cause further problems for the rest of the members of the venture. This may end up being the most important area of your agreement and should be filled out very carefully to avoid any possibility of a legal challenge.