In this chapter, I discuss the main experimental issues bearing on thecomprehension of ISAs. A first question concerns differences in processingbetween direct and indirect SAs, and a second question relates to thedifferences between the indirect uses and the literal/direct uses of ISAconstructions. Another issue is whether the understanding of an utterance asan ISA necessarily implies the derivation of the direct meaning of theconstruction used, and what properties of the construction make such adirect meaning more or less likely to be inferred.