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In this paper, we describe the development and psychometric properties of the Fogg Intent-to-Screen for HIV questionnaire (ITS HIV), which measures peoples' beliefs and intentions toward HIV screening. The ITS HIV was developed using the Theory of Planned Behavior as the framework for a developmental process that included qualitative interviews, a validation phase, two pilot tests, and a field test of the final 55-item questionnaire. The field test involved 312 homeless persons from five New England states. Cronbach alphas of the direct measures scales ranged from .72 to .90. Findings from a path analysis verified the construct validity. The psychometric estimates from these analyses suggest the ITS HIV questionnaire is appropriate for use in clinical practice or to evaluate the effectiveness of interventions. © 2010 Wiley Periodicals, Inc. Res Nurs Health 34:73–84, 2011
