Assemble a group of participants that have diverse skill and experience. Include people who will both challenge your mental models and offer option and new lines of inquiry. Let other decide whether they have something to contribute, rather than picking them. Consider including people from other discipline, business, and companies. When partners and external folks are involved this adds to the value of the assist. Why? The more experience from different context that you can access, the greater the number of dimensions with which to illuminate your problem. Small teams or syndicates (six to eight people) are more effective for working options