In the State of Washington interdisciplinary teams have been formed for transportation planning for all projects having a major social, economic or environmental impact. The responsibilities of the teams are as follows: (1) Conduct in-depth studies; (2) Develop and implement a community involvement program; and (3) Develop a departmental recommendation for solutions to transportation problems. The interdisciplinary teams that have been used have had a wide variety of disciplines represented. The purpose of this document is to outline procedures and discuss methods that will assist interdisciplinary team members and project engineers in carrying out their responsibilities. Part 1 deals with the organization and responsibilities of the team and of its members. Part 2 sets forth ten steps recommended for teams to follow in carrying out their charge. Part 3 discusses some of the practical operating problems which teams have experienced and recommends possible solutions. Methods to achieve more effective interaction among interdisciplinary team members are discussed. Also, suggestions by which technical studies and community values and attitudes can be integrated into the team's final report are included.