This document discusses two types of contracts used in transactional analysis: business contracts and treatment contracts. A business contract is an agreement between a practitioner and client about payment and administrative arrangements. A treatment contract specifies the changes the client wants to make, what the client will do to help make the changes, what the practitioner will contribute, and how they will measure success. The document also defines a contract as an explicit commitment between two parties to take a defined course of action to achieve specified goals and outcomes.