Parameters for Pseudo Runge-Kutta Methods The object of this note is to present a choice of the free parameters in the third- and fourth-order pseudo Runge-Kutta methods involving two points. This choice of parameters causes a bound on the principal part of the truncation error term to be near the minimum for the fourth-order method and at the minimum for the third-order method. CACM February, 1967 Byrne, G. D. CA670207 JB February 28, 1978 3:20 PM 1635 5 1635 1635 5 1635 1635 5 1635