Which of the following is a guide for conducting meetings and making decisions as a group?

Robert's Rules of Order is the short title of a book, written by Henry Martyn Robert, that is intended to be a guide for conducting meetings and making decisions as a group.

Originally published in 1876, it has been revised regularly through the years, including two major revisions, by Robert and his successors based on feedback from users. The most recent version is the 11th Edition published in 2011 under the name Robert's Rules of Order Newly Revised (abbreviated RONR).

This book has details on the types of groups that use it, the ways that decisions could be made, and the various situations in which decisions are made.

Several resources, including an official concise guide and information on the official website, have been released by Robert's successors to help the many different organizations and groups that use the book.