What most naturally follows?

How to make a business process model
Define the process you are modeling.
Define a process in your business operation that has a clear starting point and output. The process can be simple, like the redirection of a customer complaint, or complex, like the entire order and shipping process for an online product.
The process can involve one department or business organization level or several of each. Whatever process you are measuring, just be sure that it can be easily split into clear parts with easy-to-identify relationships between them.