Google Docs is useful when reviewers need to work on one shared draft. Establish access roles early, use comments for discussion and name important versions so major revisions remain understandable to people joining the document later.
Create a draft with clear headings, then invite collaborators with the minimum editing access they need. Use comments for questions and suggestions for proposed wording. Name important versions before major revisions, and export a copy when a document must be preserved outside the account.
