Resumo Este estudo teve por objetivo examinar a viabilidade (efetividade limitada, aceitabilidade e praticidade) do Strengthening Families Program, uma intervenção preventiva universal, para famílias brasileiras. Conduziu-se um estudo pré-experimental, com pré-teste, pós-teste, 6 e 10-12 meses de follow-up. Participaram 74 adolescentes e seus pais. Escalas sobre desfechos acadêmicos, parentais e saúde foram aplicadas nos adolescentes nos quatro tempos de avaliação. Observação direta da fidelidade da implementação e do engajamento familiar na intervenção e entrevistas por telefone com facilitadores foram usadas para investigar aceitabilidade e praticidade. Identificou-se aumento significativo em supervisão parental e autoeficácia para a aprendizagem. Altos níveis de fidelidade e engajamento parental foram encontrados, bem como engajamento moderado dos adolescentes. Os facilitadores consideraram a intervenção aceitável em suas metas, mas com procedimentos excessivamente estruturados e inadequados para famílias com baixo grau de instrução. Implicações práticas são discutidas.

Abstract The objective of this study was to examine the feasibility (limited effectiveness, acceptability and practicality) of the Strengthening Families Program, a universal preventive intervention, for Brazilian families. A pre-experimental study was carried out, with pre-test, post-test, 6- and 10-12-month follow-ups. 74 adolescents and their parents participated. Scales on academic, parenting, and health outcomes were applied to adolescents at the four assessment times. Direct observation of implementation fidelity and families engagement in the intervention and telephone interviews with facilitators were used to investigate acceptability and practicality. The results show significant increase in parental supervision and learning self-efficacy. High levels of fidelity and parent/guardian engagement as well as moderate levels of adolescent engagement were found. The facilitators found the intervention had acceptable goals, but procedures excessively structured and unsuitable for families with low educational level. Practical implications are discussed.

Abstract This study sought to evaluate the cultural adequacy of materials and procedures of the Strengthening Families Program (SFP 10-14-UK) and to identify requirements for its cultural adaptation to Brazilian families. The descriptive study had 33 informants, including external observers, managers, multipliers, facilitators, adolescents, and parents. The data were collected at a pilot application in the Federal District. Direct observation was applied to four intervention groups, with seven meetings of 150 min for families, parents/guardians and adolescents, and mixed nominal groups at the end of the interventions. The results, analyzed through content analysis and descriptive statistics, provided evidence that SFP was perceived as sufficiently appealing, culturally relevant, and partially clear. Recommendations for cultural adaptation of linguistic aspects of the materials and procedures were made, considering the cultural and educational differences of the participant families. Focus on implementation quality, including infrastructure, families' mobilization and continuous planning, was recommended. Replication studies in other Brazilian regions and analyses of contextual and political dimensions are suggested.