“…However, three studies were conceptualized at a broad level, but had few contacts and less than three significant results (Barnard et al, 1983;Siege1 et al, 1980;Wandersman, Wandersman, & Kahn, 1980). By contrast, four studies with a more limited focus on the family interaction, but that included 1 1 or more contacts showed more pervasive effects (Barrera, Rosenbaum, & Cunningham, 1986;Field, Widmayer, Stinger, & Ignatoff, 1980;Nurcombe, Howell, Rauh, Teti, Ruoff, Brennan, & Murphy, 1984;Scarr-Salapatek & Williams, 1973). Particularly informative in regard to the interrelation of the neediness of the population, the broad conceptualization of the intervention, and the effect of duration is the work of Kathryn Barnard and her colleagues.…”