“…The first issue concerns the importance of using longitudinal methods to track the pattern of change in social relationships over time. Longitudinal studies have indicated that friendships and peer groups experience considerable fluctuations over time (e.g., Berndt & Hoyle, 1985;Bukowski ifeNewcomb, 1984;Caims, Leung, Buchanan & Caims, 1995;Cohen, 1977;Hallinan, 1980;Hallinan «feTuma, 1978;Horrocks & Buker, 1951;Thompson & Horrocks, 1947). There is little agreement over the most appropriate methods for the identification and longitudinal tracking of peer relationships which makes it difficult to summarize across studies.…”