... MI) bringing the total number of participants to 148. To analyse the results a simple t-test will be used. Alcohol misuse not only affects the health and welfare of individuals themselves but also has a major impact on family relationships, communities and society as a whole. In order to combat this, a small number of major trials of psychosocial treatment in Britain have been carried out (e.g. Edwards & Guthrie, 1967; Edwards & Orford, 1977). Although these earlier studies provided valuable findings, trials of this size have insufficient statistical power to detect small to medium size effects in comparisons of one form of treatment with another. When two or more treatment methods conveying basic care and attention are compared, expected effects are moderate (Mattick & Jarvis, 1993), but remain potentially important when widespread application of treatments over a large number of clients is predicted. Moreover, if treatments differ in costs, the ...

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