The concept of process is very closely interrelated to the concept of procedure when it comes to the function of project management. Whereas the idea of procedure refers specifically to a highly detailed series of specific steps that are to be taken over the course of the project, which are typically to be followed in a highly specific order as well, and in most cases, the endpoint of the procedure as a whole is the accomplishment of a pre-specified task, the idea of process is slightly different. Process refers specifically to any pre-defined set and series of interrelated actions, activities, and events that the project management team and or the project management team leader engage in for the purposes of attaining a particular level of achievement in regards to a specified series of products, services, and or results. Process can also refer to the specific order in which things must be done in order for the project to continue in the appropriate manner.
This term is defined in the 3rd edition of the PMBOK but not in the 4th.