Summary. The aim of this investigation was to examine the relationship between social network deficits and the occurrence of suicidal behaviour, and to describe the short-term interpersonal consequences of a suicidal attempt. Two questionnaires, concerned with the extent and self-perceived adequacy of social network, formed the basis of a structured interview. Fifty-two suicide attempters were interviewed within 48 hours of their attempt, and again six weeks later, and undertook a weekly self-rating task. A group of 52 non-suicidal individuals of comparable age, sex, social class, and marital and employment status underwent the same interview programme. The results indicate that the social networks of suicide attempters are impaired relative to non-suicidal individuals, and that improvement in the social network following an attempt is limited to attempters with no formal psychiatric disorder, and to measures of perceived adequacy and satisfaction. The findings add support to the importance of psychiatric assessment of the nature and the adequacy of the social network in relation to suicidal individuals.Theoretical and research evidence indicates a relationship between disrupted social networks and the occurrence of suicidal behaviour. The behaviour has been variously attributed to increasing social isolation (Jacobs and Teicher 1967), to disturbances in close relationships (e.g. Richman 1970, 1972), and to the impairment of interpersonal communication (e.g. Fawcett et al. 1969).A process of progressive social isolation from meaningful relationships has been detailed by Jacobs and Teicher (1967) in the life histories of adolescent suicide attempters. A history of chaotic and excessively mobile family life, repeated rejection experiences (Shrut 1968), and closed family systems which prevent the potentially suicidal member from making outside contacts (Rosenbaum and Richman 1970) has been documented by clinical studies. Information on home sharing, interpersonal relationships, and occupational and social activity indicates that suicide attempters have poor contacts with family, friends, and the wider community, and that a great many are without any form of personal contact (Bille-Brahe and Wang 1985).Existing relationships are also impaired. Clinical interviews with suicide attempters and their relatives reveal an almost universal pattern of family involvement in the pressures that initiate the suicidal act (Rosenbaum and Richman 1972). Assessment of communication patterns indicates that the quality of interpersonal communication between spouses deteriorates as the degree of suicidal behaviour in one partner increases (Bonnar and McGee 1977). Chronically disrupted relationships, marital isolation, and distorted communication all characterise the high risk attempter (Fawcett et al. 1969).Consideration has also been given to the importance of social network variables consequent to the act. Follow-up studies of attempters have noted the frequency of the attempter's desire to effect some interpersonal change via suici...