Where several individuals join together to pursue a common goal, it is useful to clarify responsibilities and competencies. This object can be accomplished by means of a functional description, the rules of distribution of responsibilities or by functional specifications. These documents specify the name of each function, to which body or area it belongs, what the duties, competences and responsibilities of the person entrusted with this function are and to whom he/she has to report on their work, i.e. who is the supervisor. A function diagram lists all functions available in the organisation.