Claim: The Yoshizawa–Randlett system (a system used to describe the folds of origami models) was first described in Samuel Randlett's Art of Origami in 1960 after Samuel Randlett and Robert Harbin added a few symbols to Akira Yoshizawa's diagramming.
Evidence: The Yoshizawa–Randlett system was first described in Samuel Randlett's Art of Origami in 1961.