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However , the generalizability of these findings to children from ethnic minority and low socioeconomic backgrounds has not been established . It will limit the generalizability of the results , however , because only larger districts will be included in the evaluation . Data will be presented from each of these four programs that demonstrate the efficacy of family therapy and the apparent generalizability across populations , as well as intervention sites . Assuredly , replication of this study could enhance the generalizability of the findings . To evaluate the generalizability of results , students who remained in the program were measured against those who dropped out .