Going into business with another person enables you to each draw off of the other person's strengths. While many partnerships start off well, there are times when things take a turn for the worse. In these cases, it's imperative that you take steps to resolve the issue in a way that protects the company.
One of the most important things you can do is to set the conflict resolution methods in the partnership agreement. Even if you don't think you'll have to use them at the start of the partnership, it's better to have them ready if the need arises.