Surface Viscoelasticity is of major importance in foams and emulsion properties. The present project is to study the viscoelastic behaviour of various surfactant-polymer systems both at air-solution and oil- solution interfaces to model both foam and emulsion interfaces. For this purpose, various surface waves techniques will be used, already available in the host laboratory. An important previous work on surfactant solutions has already performed in the host laboratory, where there is a considerable experience with the techniques and the basic problem of connections with foam and emulsion behaviour. The applicant has already a background in surface waves techniques and in polymer and surfactant systems.