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How to write a business process document
Gather a knowledgeable team.
At the beginning and throughout the process document creation process, you will need to work with a team relevant to the process you are outlining. Make sure to involve the people who carry out the process and their immediate superiors, as well as any upper-level management who need to approve changes to the process as you go.
Try using meetings or informal focus groups with these people at the beginning when modeling the process. This will ensure that you don't miss any crucial steps or parts of the process.