New evolutionary scenarios for short orbital period CVs

We suggest new evolutionary scenarios for non-magnetic short orbital period CVs. The first model is the analogy of the `hibernation scenario' or the `modern hibernation scenario'. The second one is an extension of Mukai and Naylor (1995) ideas. All models imply a tight connection between permanent superhump systems and classical novae. We highlight the significance of the observed evolution of V1974 Cyg, which might pose a major problem to Mukai and Naylor concept.