The interaction of a sugar-based nonionic surfactant (dodecylmalonobis(N-methylglucamide)) with an anionic surfactant of similar tail length (sodium dodecyl sulfate) has been studied by CORE PGSE NMR. The results show that the two surfactants mix ideally and noncooperatively and that the composition of the micelle is thus given by the initial concentrations of the two surfactants.