Robert's Rules in Plain English 2e: A Readable, Authoritative, Easy-to-Use Guide to Running Meetings

When a main motion is on the floor, that piece of business is the only one that the assembly can discuss.

Now that the motion has been made and the question has been stated for the assembly, the presiding officer can open the floor to debate.

a nifty rule that helps ensure that every participant at the town meeting gets to express his or her thoughts on each issue; no one may speak more than twice on a particular issue until everyone who wants to speak on the issue has had an opportunity to do so once.