The Intention of this thesis was to help elucidate psychological mechanisms underlying suicidal behaviour. Chapter one Introduces risk factors and current treatments for suicidal behaviour before going on to investigate whether a cognitive model of suicidal behaviour, 'the cry of pain', could add to our understanding of discrepant treatment findings, and provide new opportunities for understanding proximal risk factors for suicidal behaviour (in combination with the differential activation hypothesis).EThOS - Electronic Theses Online ServiceGBUnited Kingdo