About
Clear context for educational assessments
Cognitive Index provides self-guided practice and educational explanations. The site is not a clinical testing service, and its results should not be used as professional diagnoses or official credentials.
Supported assessments
The catalog includes original reasoning, digit span, working-memory, processing-speed, and verbal-numerical activities, alongside an AGCT historical practice form, a career-interest survey, and a public-domain Big Five questionnaire. Each introduction explains the format, free result, and limitations.
Compare assessmentsLearning library
Guides cover score interpretation, measurement limits, assessment history, and responsible use of online results.
Open the libraryHow we prepare and review content
Cognitive Index is an independent educational website, not a university, clinic, or professional testing organization. Guides are checked against the current assessment behavior, distinguish original activities from historical or public-domain material, and link supporting sources when making scientific or historical claims.
“CognitiveIndex Editorial Team” is an organizational byline, not a claim of licensed clinical review. If a qualified specialist reviews a page, that person and role will be named on the page.
Interpret results cautiously
Online performance can vary with sleep, stress, interruptions, device setup, and familiarity. High-stakes educational, clinical, employment, or legal decisions require appropriately qualified professional guidance.
To report a factual error or request a correction, email cognitiveindexorg@gmail.com. We review corrections against the product and cited evidence, then update the page and its modification date when warranted.