Ford, Lewis S.  “Reasons, Causes, and Decisions.”  Southwestern Journal of Philosophy 3 (Fall 1972): 51-62.

Abstract

An informal presentation of A. N. Whitehead's characteristic thesis concerning time, causality, freedom, and subjectivity by means of a justification of his ontological principle that actualities alone provide reasons.  Subjective decisions function objectively as efficient causes, while rational patterns, themselves ultimately derived from decisions, may be employed to justify the scope and effectiveness of our decisions. This dependence of reasons, whether in the form of efficient causes or rational patterns, upon subjective decision as their creative source, indicates an unsuspected existentialist root to Whitehead's thinking.  [Abstract from The Philosopher’s Index]