A government contractual relationship for the delivery of an end item through a prime or subcontract relationship or to provide assistance to another company. Variants include: 1.) A prime contract awarded to established source (leader) who is obligated to subcontract to and assist another source (follower). 2.) A contract is awarded requiring the leader to assist the follower who has the prime contract for production. 3.) A prime contract awarded to the follower for production, and the follower is obligated to subcontract with a designated leader for assistance. (The leader may be producing under another contract.)