Over a period of more than thirty years, Chisholm formulated and reformulated Brentano’s Thesis. Perhaps the most insightful discussion of his views and their connections can be found in David Sanford’s ‘Chisholm on Brentano’s Thesis’. In reply to that essay, Chisholm said, ‘Anyone who wants to understand what I have been up to in trying to formulate criteria of intentionality, should read Sanford’s paper’ ([LLP], 215).