Assessment literacy
The assessment glossary — jargon made plain
Last reviewed: October 2026 · Reviewer: AssessWiki Editorial
Every assessment article leans on a handful of technical terms. Here they are in plain language, so you can read any test's claims — ours included — and decide for yourself. Links go deeper where it helps.
Judging a test
- Construct
- The idea a test is trying to measure — "extraversion," "work values." If a tool can't name its construct clearly, that's your first warning.
- Validity
- Does it actually measure what it claims, and predict what it says it does? A test can be consistent and still not valid.
- Reliability
- Consistency. Do you get a similar result twice (test–retest), and do the questions within a trait agree with each other?
- Self-report
- You describe yourself. Useful, but shaped by mood, context, and how kindly you're feeling — it's a snapshot, not an outside measurement.
- Social-desirability bias
- The pull to answer as the "good" version of yourself. Well-built tests include items to detect it; short casual quizzes usually don't.
- Barnum effect
- Why vague, flattering descriptions feel eerily accurate to almost anyone. Feeling "seen" isn't the same as being measured. See is 16Personalities accurate?.
Scores and comparison
- Likert scale
- The "strongly disagree → strongly agree" rating rows most questionnaires use. A 5- or 7-point scale, named after Rensis Likert.
- Norms / norming sample
- The group your score is compared against. A percentile is meaningless without knowing who's in it — see average personality scores.
- Percentile
- Rank within that comparison group, not a level. "73rd percentile" = higher than ~73% of that sample — not "73% of anything," and not permanent.
- Factor analysis
- The statistical method that reveals trait groupings — how "the Big Five" was found rather than invented.
Frameworks you'll meet
- Big Five / OCEAN / Five-Factor Model
- Five continuous traits — Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism. The most-researched framework in trait psychology. See the free Big Five assessment.
- HEXACO
- A six-trait model that adds Honesty-Humility to the Big Five's ground. Compare Big Five vs HEXACO.
- Trait versus type
- A trait is where you sit on a spectrum; a type sorts you into a box. Types feel tidier but lose the nuance near the middle — see 16Personalities alternatives.
- RIASEC / Holland Code
- Six interest types (Realistic, Investigative, Artistic, Social, Enterprising, Conventional) used to match careers. See free career assessments.
One principle behind all of it: a score is a mirror, not a verdict. If you want the full method, our editorial policy explains how every entry is reviewed — and why we publish no numeric ratings.
AssessWiki is an independent assessment library. We publish no numeric ratings, and placement is never for sale. Definitions here are educational and simplified, not a substitute for a psychometrics textbook.