 RCCP connects with a number of threads in Reichenbach’s thought. Reichenbach had developed and defended a frequency interpretation of probability (Reichenbach 1949), as well as a thoroughgoing probabilistic epistemology (Reichenbach 1938) He had also explored the connection between probability and causation in earlier works (Reichenbach 1925 [1978], 1930 [1978]). The Direction of Time takes the project further in developing a probabilistic metaphysics. Reichenbach had also explored the connection between causation and the direction of time in Reichenbach (1925 [1978]) and Reichenbach (1958). The latter work developed a causal theory of time in the context of relativity theory.