Recent papers suggested that solar wind regions with low Alfv¿nic-type correlation have to be related to local generation of Alfv¿n waves with opposite sense of propagation. Stream shears were proposed as local sources of fluctuations through the development of a Kelvin-Helmholtz instability. We show that a decrease of the Alfv¿nic correlation can be accompanied by the appearance of strong compressive fluctiations. In these cases the low Alfv¿nic correlation should be related not to a superposition of Alfv¿n modes with mixed propagation but rather to a lack in Alfv¿nicity of the fluctuations themselves, due to the presence of other kinds of perturbations of structures in the solar wind. Conversely, when incompressibility is reasonably well satisfied, we are able to gain convincing evidence of an Alfv¿n wave generation in a velocity shear region. ¿ American Geophysical Union 1989