Which reliability concept states that when items correlate with each other and the total score, they measure parts of the same construct?

• A. Predictive Validity
• B. Concurrent Validity
• C. Content Validity
• D. Internal Consistency

Answer: (D)

Internal consistency measures whether the items on a test hang together and tap into the same underlying attribute. When each item correlates with the others and with the overall score, it shows they’re all measuring parts of the same construct, giving cohesive and reliable results. Cronbach’s alpha is a common way to quantify this; higher values indicate stronger internal consistency. The other ideas—predictive validity, concurrent validity, and content validity—address different aspects of usefulness or coverage, not how well the items relate to each other to measure one construct.