Among the most suggestive discussions of methodological effectiveness in philosophical investigation is the analysis by Hector-Neri Castañeda in two of his essays: in "Leibniz's Meditation on April 15, 1676" (Castañeda 1978) and "On Philosophical Method" (Castañeda 1980). In both places, Castañeda gave the foundation for the way that we should analyze the works of individual philosophers. Castañeda proposed the "Darwinian" approach, according to which a philosopher's corpus is conceived as being possibly composed of different sorts of claims and views that do not necessarily have coherence and unity. The hard task is to unravel that unity usually lying behind the mass of philosophical theses and arguments.