Plastic sliding, strained states and current conversion in Density Waves.

We outline a theory of coexisting elastic and plastic deformations in slidi ng Charge Density Waves. They occur in the course of the conversion from th e normal current at the contact to the collective one in the bulk. Several mechanisms of phase slips via creation and proliferation of dislocations ar e compared. We present a modeling which helps to interpret space-resolved s tudies in recent [1] and earlier [2] X-ray experiments, in multi-contact [3 ] and optical [4] studies.