This chapter focuses on the measurement of Expressed Emotion (EE) and the range of social interventions it has generated. EE has been found not only in families with schizophrenia, but also in a wide variety of both physical and psychiatric conditions, ranging from weight loss and diabetes to manic depression. The training of staff to deliver social interventions to families and possibly to modify their own behaviour in working with the long-term mentally ill is just developing, and the results remain to be quantified. Both these areas raise issues about evaluating therapeutic processes, although doing so systematically is still in its infancy. It may be that gaining experience in the evaluation of clinical process, and in EE-related intervention, will be of benefit to those wishing to develop interventions based on other aspects of social support.