Health and Psychosocial Instruments (HAPI) This link opens in a new windowCovers 1985-present. Contains articles describing questionnaires, rating scales, index measures, scenarios, vignettes, observations, checklists, manuals, etc. Under 'Limit to,' select Primary Source or Secondary Source. Primary Source means the citation is the original source for the instrument. Secondary Source means the instrument was originally developed by another author or for another study. Use reliability and validity as keywords to locate instruments with tested psychometric properties.