We present an elegant exact formula for the gaugino beta-function in a
softly-broken supersymmetric gauge theory, of the form beta(M) = O(be
ta(g)/g), where beta(g) is the gauge beta function and O is a simple d
ifferential operator acting on the gauge coupling g and the Yukawa cou
pling. (C) 1997 Elsevier Science B.V.