This paper is concerned with the metathesis of contiguous sibilants and stops. The paper is divided into the following parts: 1) a summary of several different descriptions of obstruent metathesis, 2) a list of examples illustrating the process, 3) discussion of experimental work on the perception of the clusters, and 4) concluding remarks noting that: (a) the examples indicate that the reordering of a stop-sibilant cluster occurs in a greater number of languages and with more frequency than the reordering of a sibilant-stop cluster, and (b) there is evidence that the occurrence of a sibilant-stop reordering implies the presence of an alveolar or palatal affricate within the sound system of a language. (Author/PMP)