First, we find in the skeptics dictionary that the concept is not well defined. http://skepdic.com/occam.html Next, the concept predates modern physics and is no more valid than 12th century physics. Consider Occam's original premise: Clearly the credibility of this premise died with QM. ------ RP Feynman Not only is this concept ill defined and out of date, it is often used as a scientific principle – like F = ma – when it fact it is a philosophical concept; not a scientific law. The use of this concept to rule out a competing theory is only valid to the extent that it is obvious; and without need of the long dead Occam or his nasty old rusty razor. The application of this principle in any practical matter is pseudoscience.