Pt. I. A survey on differentiability of six operators in relation to probability and statistics -- Pt. II. Product integrals, Young integrals and p-variation -- Pt. III. Differentiability of the composition and inverse operators for regulated and a.e. continuous functions -- Pt. IV. Bibliographies on p-variation and [phi]-variation / R. M. Dudley, R. Norvaisa and Jinghua Qian.