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We study asymptotically free SU($N_c$) gauge theories with ${\cal N}=1$supersymmetry, including the purely gluonic theory and theories with $N_f$copies of a pair of massless chiral superfields in the respectiverepresentations $R$ and $\bar R$ of SU($N_c$). The cases in which $R$ is thefundamental representation and the symmetric and antisymmetric rank-2 tensorrepresentation are considered. We calculate Pad\'e approximants to the betafunctions for these theories in the $\overline{\rm DR}$ scheme up to four-looporder for the gluonic theory and up to three-loop order for the theories withmatter superfields and compare results for IR zeros and poles with results fromthe NSVZ beta function. Our calculations provide a quantitative measure, forthese theories, of how well finite-order perturbative results calculated in onescheme reproduce properties of a known beta function calculated in a differentscheme.

Study of the Renormalization-Group Evolution of ${\cal N}=1$ Supersymmetric Gauge Theories Using Pad\'e Approximants