The time has now come to draw together the various factors we have identified as significant in producing and shaping depression. The main task of this book has been to develop a causal model of clinical depression: this has been done and, we believe, it is sufficiently well based for some attention to be paid to the theory that we have developed to make sense of it. But the two must be kept distinct: claims that we make for the causal model cannot be made as yet for the more speculative theory.