Perhaps the subject s best-friend, husband, or parent. In the one-party contract, the subject wishes to change their behavior, and asks another person to be the contract manager and implement the contingencies. In a two-party contract, two people identify same or different target behaviors and complete them in the same period of time. The behavior of one subject is the reinforcer for the other subject. However, the quid pro quo goes one step farther, and states that if one person does not carry out their end of the bargain, the other person is allowed to drop the contract until the next stated time period.
Behavioral contracts are a form of antecedent manipulations.
These manipulations make the target behavior more likely to occur. The environment is manipulated ahead of time. One-party contracts are the most productive if the contract manager can be trusted to be fair. Two-party contracts are reliable if both parties are responsible enough to accomplish that which they agree to accomplish. Quid pro quo contracts are only proper if the reinforcer of one person is potent enough to motivate the other.