Robert's Rules of Order Newly Revised (RONR) 
Robert's Rules of Order Newly Revised lists 11 motions or requests falling into this category, including to appeal the decision of the chair, consideration by paragraph or seriatim, division of a question, division of the assembly, objection to the consideration of a question, parliamentary inquiry, point of information, point of order, request for permission to withdraw or modify a motion, and to suspend the rules. Most incidental motions are undebatable.
Unlike the privileged and subsidiary motions, incidental motions have no order of precedence among themselves. They take precedence over any pending question out of which they arise. Some incidental motions are only legitimately incidental at certain times or under certain conditions. For instance, the objection to the consideration of a question can only be raised before there has been any debate.
- Robert, Henry M. (2000). Robert's Rules of Order Newly Revised, 10th ed., p. 67 (RONR)
- RONR, pp. 70-71
- RONR, pp. 258-259