Validated self-assessment instruments for personality and psychological traits.
The IPIP-NEO-PI is a 120-question public-domain adaptation of the NEO-PI-R. Measures Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism with percentile scores.
The AQ by Baron-Cohen et al. (2001) is a 50-question instrument measuring autism-spectrum traits in adults across social skills, attention switching, attention to detail, communication, and imagination.
