For regulations, you can organize them into a comprehensive table of contents that will be an outline of the document. Try to ask the questions your readers would ask. Answer each question immediately. It also increases the chances that they will see a question that they didn't have, but need to know the answer to. This format is enormously helpful to readers.
Active voice makes it clear who is supposed to do what.
It eliminates ambiguity about responsibilities. Use the appropriate tone In regulations, tone is not really an issue. But the tone of a letter affects how well the reader takes in your message. A cold tone can cause the reader to tune out the message. In some cases, it causes them to put down the letter rather than attempting to read it at all.