Reliability, Validity and Sensitivity in Program Evaluation
It is important to ensure that the instruments (for example, tests, questionnaires, etc.) used in program evaluation are as reliable, valid and sensitive as possible. According to Rossi et al. (2004, p. 222), 'a measure that is poorly chosen or poorly conceived can completely undermine the worth of an impact assessment by producing misleading estimates. Only if outcome measures are valid, reliable and appropriately sensitive can impact assessments be regarded as credible'.
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