Cronbach's alpha was higher than 0.50 for all the 10 psychosocial scales, while Cohen's kappa showed poor to substantial test retest reliability on the sexual behaviour items (K = 0.14 to 0.69). Results: The questionnaire demonstrated good internal consistency and adequate test-retest reliability. Test-retest reliability studies were conducted at each site. Methods: The instrument was developed in a series of steps that involved a review of existing instruments use of empirical data and secondary literature supporting an association between the variables of interest and sexual intercourse or condom use operationalizing the constructs of the theoretical model employed and using the objectives of the intervention. Aims: This article reports on the development and psychometric properties of an instrument to evaluate school-based HIV/ AIDS interventions aimed at adolescents in three African sites.
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