Starting off substantive engagement with Sun Tzu with a focus on calculation serves a positive purpose. It is a way of emphasizing to contemporary audiences that there is more to Sun Tzu than being tricky or unorthodox – the strands of his way of war that readers, at least Western ones, widely note and often lionize. In present usage, the umbrella term “calculation” is intended to serve as a flexible rubric capable of covering intendedly rational judgments of more than one kind, many intuitive, others more formally structured.