Governance documents (such as constitutions, bylaws, and special rules of order) are like fingerprints. Everyone’s fingerprints look more or less the same, but, of course, no two sets of fingerprints are identical.
So, on the one hand, parliamentarians study and train to know all the general rules that exist about what governance documents need to say. On the other hand, a professional parliamentarian also has quite a bit of experience in tailoring governance documents to the unique needs of different organizations.
A professional parliamentarian, then, is an invaluable asset in drafting, amending, and revising your organization’s governance documents.