Abstract
The method of effective charges has been proposed by Grunberg as a natural solution to the problem of renormalization-scheme dependence of finite-order perturbation-theory results. In this paper I shall argue that this solution relies in a crucial way on certain rather ad hoc assumptions. Some statements contained in his paper are furthermore commented upon and the peculiarities of the renormalization-scheme ambiguity for perturbation expansions which are divergent when considered in a fixed renormalization scheme briefly mentioned.
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