:::Why can't we just replace the final clause in my version with the final clause in your version? "In Whitehead's view, then, "matter" and/or "substance" are not adequate concepts to describe the basic elements of the world, because each misses the active and experiential nature of these basic elements, and each fails to adequately account for change."  I still don't want to get into "form," and I don't see the need to say "classical philosophical concepts" followed by the concepts, when we can just name the concepts.