“…Moreover, it suggests that their range of applicability is very wide. Jealous behaviour, for example, has many ramifications, being associated both with the tendency of families in trouble to form segmented systems on the assumption that 'two is company, three's none', and also with the fact that such families often resist their members associating with outsiders (Minuchin, 1974;Doane et al, 199 1 ;Byng-Hall, 1995;McCluskey and Bingley Miller, 1995). This fact of itself loosens the social control over the family, creates considerable difficulties for family therapists attempting to gain access to such families and often makes things worse.…”