This Practice Note considers heads of terms (also known as a memorandum of understanding (MoU), letter of intent (LOI), comfort letter, pre-contract protocol, term sheet or heads of agreement) in the context of commercial deals. It considers what heads of terms are, how the courts determine whether heads of terms are legally binding, the commonly used phrase ‘subject to contract’, creating legally binding provisions, the duty to negotiate in good faith, and provisions typically included. It also considers which terms are usually intended to be legally binding and provides drafting advice on what to consider and include. This Practice Note also considers how to supersede the heads of terms in the final contract. For heads of terms for a commercial deal and drafting notes, see Precedent: Heads of terms—commercial contracts. We have produced a collection which is a comprehensive, interactive resource to managing contracts at each of their key lifecycle stages: negotiation, creation, review, variation and termination. It provides an overview of the key considerations and the processes for negotiating, reviewing, varying, assigning, novating or terminating those contracts. Each section or phase includes practical