  String theory developed by demanding consistency with quantum mechanics. In
this paper we wish to reverse the reasoning. We pretend open string field
theory is a fully consistent definition of the theory - it is at least a self
consistent sector. Then we find in its structure that the rules of quantum
mechanics emerge from the non-commutative nature of the basic string
joining/splitting interactions, thus deriving rather than assuming the quantum
commutation rules among the usual canonical quantum variables for all physical
systems derivable from open string field theory. Morally we would apply such an
argument to M-theory to cover all physics. If string or M-theory really
underlies all physics, it seems that the door has been opened to an
understanding of the origins of quantum mechanics.
