There are no procedures or even general policy that can apply. An example that humans could relate to would be a setting where one's physical body merges with another's - the two becoming physically one. Another situation humans could relate to would be size differences, where an entity is incarnated into something many times larger or smaller than the physical body of another, with the smaller entities finding themselves on occasion inside the larger. Beyond social interactions in strange social settings, strange physical setting are also encountered. Humans are used to terra firma under their feet, but how might they go about their day in a nebula setting, where nothing is firm and all is swirling constantly.
Triads give the venturing entities a means of quickly making decisions during their ventures.
The tie is broken. Either all agree or two of the three agree or two of the three disagree with the third. The issue is instantly settled.