Definition
In the context of a written assessment, reliability is the degree to which a test produces consistent results when given to the same student or group of students under the same conditions. A reliable test yields similar scores across repeated administrations, different versions, or different graders.
Plain English
How consistently a test measures what it measures. If the same student took it again, or a different version of it, they should get a similar score.
Context Anchor
Seen when aviation instructors are building or reviewing written tests, quizzes, and stage checks.
Derivation
From the Latin 're-' (again) and 'ligare' (to bind or fasten), giving the sense of something that can be bound to or counted on again and again. In testing, it points to results you can count on to repeat.
Why Pilots Care
Ensures that assessments accurately reflect a student's knowledge rather than varying due to test flaws, supporting fair training decisions.
Intuition Check
Reliability does not just mean that a test seems professional or well written. In this context, it means the test gives consistent results and does not change unfairly because of unclear questions or uneven conditions.
Example Sentence 1
The instructor reviewed the quiz for reliability by giving it to two similar groups of students and comparing the score patterns.
Example Sentence 2
Instructors check for reliability in assessments to make sure that differences in scores reflect actual differences in knowledge, not inconsistencies in the test itself.