This presentation deals with the difficulty of assembling the wealth of available data on nasality into a coherent whole, taking into account all of the seemingly divergent findings yielded by electromyographic, articulatory, aerodynamic, acoustic and perceptual investigation. Some of the difficulties will be illustrated by confronting data published in the literature about nasality (Beddor, Bell-Berti, Benguerel, Clumeck, Ohala, Vaissière, among others), with emphasis on Ph. D. dissertations about nasality (in particular: work by Amelot, Cohn, Delvaux, Krakow, and Rossato). A set of new data, from ongoing research by students at our laboratory, will also be adduced. Some of the remarks on perception, based on spectrograms reading courses, call for systematic verification. In particular, EMG-based studies tend to conclude to a large anticipation, as do fiberscopic studies. Aerodynamic data generally report more extensive carry-over than anticipation .