This chapter describes briefly the way Klein's introduction of the concept of projective identification has led to developments in technique. In this chapter Spillius Elizabeth Bott was using the idea of projective identification rather as Bott think Klein might have done. Bott thought patient's perception was distorted by his unconscious phantasy of projecting aspects of himself and his internal objects into me. This involved in particular his inability to enjoy anything for its own sake. Bott have described sessions with three patients illustrating slightly different ways of using the idea of projective identification clinically. Mr. A sought analysis because of work difficulties and a sense of meaninglessness in his life. In one session he had a sudden fantasy, which he described as 'grandiose', of developing his so-called small research into a major undertaking with a grant from America etc. Joseph and Bion have extended Klein's model by emphasizing the interaction between patient and analyst.