
&gt; Why is "cause and effect" a sibling node of "whole-part"?  

MW: Well it would be more relevant to ask why it is under 
Relation. Being a sibling of Whole-Part simply means it isn't
under it. We treat cause and effect has how activities cause 
states to start or terminate (events).

&gt; What is causality?  

MW: In our use of the term, simply the link between activity 
and the change(s) it brings about. There are of course classes 
of cause that talk about what types of activity cause what types
of c