Depending on the type of field research, you may break down what needs to be done individually or choose to send people out in pairs or groups. Pairs and groups, for example, work particularly well for observational projects where each person may observe something different. Also, construct a plan for how people will "report" back on research. Should they make a more extended copy of their notes? Should the group decide what's important to focus on and then ask each person to share that portion of their work? No matter what the decision, make sure each group member has the entire body of information to work from. Observations and interviews can't be used by everyone like a library source can unless the person doing them has a detailed, written record.