International Journal of Social Science Research (IJSSR)

Reliability and Validity of the Neo-Factor Inventory: A Systematic Review

Psychometric properties are the quantifiable aspects of a test that indicate its statistical strength or weakness. They are intrinsic components of a test and reveal information about a test’s adequacy, relevance, and usefulness. Validity, reliability, and norming are fundamental psychometric properties of a test. The study investigates how the NEO Five-Factor Inventory (NEO-FFI) functions with respect to validity and reliability among various populations across different environments. The research reviews three key properties including internal consistency and retest reliability and construct validity from studies appearing since 2005 and focuses on these measures as they relate to emerging adults and stroke survivors and cross- cultural groups. Studies indicate robust psychometric measurement capabilities specifically for Neuroticism and Conscientiousness aspects yet Openness and Agreeableness domains present inconsistent results across various conditions. The evaluation discusses how assessment environments and cultural elements affect personality evaluation and argues for instrumentation that adjust to individual conditions. The evaluation process has two main weaknesses due to sample variability among participants and incomplete inclusion of English and grey literature sources. Keywords: Cross-cultural, Emerging Adults, FFI, Five-Factor Model, Personality Assessment, Psychometric