Proctor et al. (1992) showed that precuing the likely response location with 80% validity enhanced the Simon effect (faster responding when stimulus location, though irrelevant, corresponds with response location than when it does not), consistent with earlier findings of Verfaellie et al. (1988). Hasbroucq and Possamai (1994) reinterpreted Proctor et al.'s results as showing evidence that the magnitude of the Simon effect depends on irrelevant precuing of stimulus location. In the first part of the paper, we examine their argument and note logical deficiencies of it. In the second part, we report results of two experiments in which the magnitude of the Simon effect was found to depend on precue validity and whether the orientation of the response locations was the same as that for the precue direction. These results fit comfortably with the view that the response-location precues affect response-selection processes, but are difficult to reconcile with the hypothesis that the precues affect stimulus-identification processes.