There has recently been an increase in interest, among information systems architecture practitioners, in using viewpoints for architectural definition and description. This has been caused by a number of factors including the publication of IEEE standard 1471 and the increasing adoption of RUP (and its “4+1” viewpoint set). This short experience report outlines the experiences that two software architects have had in evaluating and applying a number of viewpoint sets to information systems development. The strengths and weaknesses found with each viewpoint set are described and some general observations on viewpoint set use and definition are presented.