Dephasing and Non-Dephasing Collisions in Nanostructures

When I was originally asked to give two lectures at this workshop, one on this subject and one on “charge quantization” effects, I felt that there was at best a tenuous link between the two topics. Now I feel that there is a fundamental connection, and that it is absolutely essential to understand what we mean by “dephasing” before we can assess many of the results obtained in the last few years on charge quantization and related effects.