Kirkpatrick, Frank G.  "Subjective Becoming: An Unwarranted Abstraction?"  Process Studies 3, no. 1 (Spring 1973): 15-25.

Abstract

The problem of the subject in process thought can be analyzed in terms of being and becoming.  Process assumes that to be a being is to be determinate, to have ceased becoming.  Lewis Ford argues that a subject is not a being, but a process of unification aiming at becoming a being.  The difficulty with this view is that we are asked to think of becoming as an abstraction from being.  If it is merely an abstraction there is no problem but if we try to think the abstraction as also possessing subjective attributes (intention, self-determination, etc.) we cannot do it.  The fundamental difficulty which the process model faces is trying to retain language appropriate only to a subject for a process which is not yet a subject.  Some minimal level of determinate being must be attained before subject language can be legitimately employed and this level is denied by process thought.  [Abstract from The Philosopher's Index]