In this paper I review the locality domains of contextual allomorphy, contextual allosemy and morphophonology with a special emphasis on compounds. I show that when the applications of these processes within compounds are compared, we observe a distinction between the domain of contextual allomorphy and contextual allosemy, on one hand, and morphophonology on the other. I argue that the mismatches in the domains in question lie in the timing of the operations where operations applying prior to vocabulary insertion are constrained by cycles/phases, whereas operations applying after vocabulary insertion are constrained by the timing of concatenation. Under such approach, all of these processes will make reference to the same morphosyntactic structure although their domains will be marked by different points in that same structure.