What is the chief difference in the rules governing original and incidental main motions?

The chief difference between the rules governing original and incidental main motions lies in the application of the objection to consideration. Specifically, objection to consideration is a parliamentary procedure that can only be used against original main motions. This means that when a main motion is brought before the assembly for consideration for the first time, any member can object to its consideration altogether. This objection can prevent the motion from being discussed or voted upon.

In contrast, incidental motions, which are typically related to or arise out of the main motion or the business at hand, do not have this same restriction. They can be presented and discussed without the concern of an objection to consideration because they often relate to the immediate issue being discussed or provide necessary procedural assistance. Therefore, the correct understanding of the difference highlights how original main motions are uniquely subject to this specific procedural limitation, while incidental motions are not.