Face to face communication plays an important role in human to human communication. Thus it is natural to assume that an important quantity of non-verbal information can be obtained for man-machine interaction by watching faces. However, even more than hands, face interpretation poses difficult problems for established machine vision techniques. In this section we briefly report on experiments with simple techniques for detecting, tracking and interpreting images of faces. The key robustness in such tracking and interpretatino seems to be combine complementary techniques.