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The paper describes a software tool, called MSWSampling, to support the evaluation of the solid wastes sampling quality. The software is a random sample generator program that simulates the sampling process of solid wastes, calculating the size of the sample that assures a desired representativeness level with respect to the content of a critical component of the lot to be sampled or the variance of the fundamental error associated to a sample of given size. The solid wastes consists of very different active classes of solid components, which are characterized by their size distribution, specific gravity, weight proportions and shape factors. The results of a case study, the municipal solid wastes that feed a composting plant nearby Lisbon, are presented.