The extent to which a technique consistently measures whatever it measures regardless of the investigator is called what?

The extent to which a technique consistently measures whatever it measures regardless of the investigator is called what?

• A. Dependability
• B. Vulnerability
• C. Reliability
• D. Validity

Answer: (C)

Reliability is about consistency in what a measurement yields across different investigators. When a technique produces the same results regardless of who administers it, it shows high inter-rater reliability. For example, if two clinicians using the same checklist assign the same score to a patient, the tool is reliable. It’s possible for a measurement to be reliable but not valid: it could be consistently off if it’s truly measuring the wrong thing. Validity, by contrast, asks whether the instrument measures what it’s intended to measure, not just whether it does so consistently. The other terms here don’t focus on that cross-investigator consistency, so reliability is the best fit.

Reliability is about consistency in what a measurement yields across different investigators. When a technique produces the same results regardless of who administers it, it shows high inter-rater reliability. For example, if two clinicians using the same checklist assign the same score to a patient, the tool is reliable. It’s possible for a measurement to be reliable but not valid: it could be consistently off if it’s truly measuring the wrong thing. Validity, by contrast, asks whether the instrument measures what it’s intended to measure, not just whether it does so consistently. The other terms here don’t focus on that cross-investigator consistency, so reliability is the best fit.