Quite frequently, defendants in major cases will decide to form joint defense groups. Joint defense groups are intended to provide defendants with significant efficiencies that result from common effort in facing a common adversary, whether in a patent case against the same patent holder, tort litigation against the same set of injured people, white-collar criminal actions against the government, antitrust litigation against the same plaintiff, and so on. But joint defense groups, which by their nature bring together several high-powered lawyers at a single defense table in the courtroom, can present unique challenges. Sometimes, joint defense groups will work as planned and the defendants will reap the benefits of their cooperation, and sometimes they will break down. Here are some best practices for joint defense groups to follow at trial that will help them succeed rather than fall apart in the heat of trial. Clear Leadership. The group should pick a clear leader. Studies of organizational behavior and dynamics show that for “pop-up businesses” with limited durations and specific tasks to accomplish, like movie production crews or trial teams, success is associated with the early selection of a team leader. Many trial teams may be afraid to antagonize a lead attorney for one of the parties who is not chosen and may thus hesitate to make a choice, but it is best to pick a leader and move forward that way. Just Enough Consultants. The group should pick one consulting firm for each trial-related task – for example, one consultant to handle all graphics and litigation consulting. The “too many cooks” phenomenon is definitely present if the group decides to select multiple vendors for key consulting roles in the trial. The attorneys should be focusing on their case, not on resolving disputes between vendors.