This section reviews two studies we undertook for our EPSRC (Engineering and Physical Sciences Research Council) project on ergonomic methods. The first was a study of training people to use the methods and an assessment of their application to a device evaluation. The second was a study of the reliability and the validity of the methods. These data were derived from the comparison of the prediction from the first study to the performance of people using the device. Further details of the first study are reported by Stanton and Young (1998a).