Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
A measurement tool refers to any instrument or method used to assess or measure a particular variable or construct in research or psychological testing.
Validity refers to how accurately and appropriately a measurement tool measures what it is intended to measure.
Test-Retest Reliability: Test-retest reliability is the consistency of measurements obtained from the same test administered at different points in time.
Internal Consistency Reliability: Internal consistency reliability refers to the extent to which the items within a measurement tool consistently measure the same construct.