Extended Electroweak Models and Their Tests in Future Colliders

Some possible tests of physics beyond the Standard Model in the next generation collider experiments are considered. The main emphasis is put on the processes which may be studied in the non-conventional $e^-e^-$, $e^-\gamma$ and $\gamma\gamma$ operation modes of the next linear collider (NLC). In particular, sensitivity of the NLC for testing the gauge boson self-interactions through the reaction $e^-\gamma\to W^-\nu$ is investigated. High energy tests of the susy and non-susy left-right symmetric models are analysed.