Transparency
Where the tests come from.
Question sources, scoring choices, and important distinctions are documented here so the experience is easy to understand and audit.
MBTI questionnaire
The 70 forced-choice items and scoring grid come from the MBTI Personality Type Test PDF published at Maximus Veritas. The result summaries on this website are newly written for Type & Traits.
Big Five questionnaire
The 50 statements and scoring directions come from the International Personality Item Pool's 50-item representation of Goldberg's Big-Five Factor Markers. IPIP items and scales are in the public domain.