1. First principles In the simplest case, a state will grant a concession granting the right to explore for and to produce petroleum to a single company, acting as the concession holder. This has typically been the case for relatively modest petroleum projects, where a low level of technical complexity and/or of financial exposure (found, for example, in respect of any combination of shallow depth drilling, onshore petroleum deposits or crude oil production) means that a single company can hold the concession and can comfortably perform the associated work obligations. In this situation, it is not necessary to consider the manner in which a joint venture will be documented, as the sole concession holder has no other person to enter into a joint venture with in order to perform the concession. For more information on concessions, see Practice Notes: Understanding upstream petroleum agreements—concessions, production sharing contracts and service contracts and Production Sharing Contracts. However, where petroleum exploration and production (E&P) projects become more complicated and more