| Buss Perry Aggression Questionnaire (BPAQ) | Self-report | Adults and older adolescents reflecting on physical aggression, verbal aggression, anger, and hostility patterns | 29 | The Buss–Perry questionnaire separates aggression into physical aggression, verbal aggression, anger and hostility. |
| Big 5 Personality Test (FFM) | Self-report | Adults and older adolescents exploring relatively stable patterns of openness, conscientiousness, extraversion, agreeableness, and emotional stability | 50 | This 50-question personality inventory describes five broad dimensions: openness, conscientiousness, extraversion, agreeableness and neuroticism. |
| Empathy Quotient (EQ) | Self-report | Adults exploring self-reported empathy, social understanding, and responses to other people's feelings | 60 | The Empathy Quotient asks about understanding other people and responding to their experiences. |
| Hare Psychopathy Checklist (Original) (PCL-22) | Clinician-rated | Trained forensic or clinical professionals evaluating adults with interview data, collateral records, and observed behavior; not for self-assessment | 22 | This 22-item checklist concerns interpersonal, emotional and behavioural features discussed in the early psychopathy-checklist literature. |
| Personality Type Indicator (PTI) | Self-report | Adults and older adolescents exploring preferences in attention, information processing, decision-making, and daily-life structure | 70 | This 70-question inventory explores preferences through paired choices about social energy, information, decisions and daily structure. |
| Revised Mystical Experience Questionnaire (MEQ-30) | Self-report | Adults aged 18 or above and research participants reflecting on one specific past altered-state or mystical-type experience | 30 | MEQ-30 asks about the qualities of a particular experience, including unity, positive mood, altered feelings of time or space and difficulty putting the experience into words. |
| Toronto Empathy Questionnaire (TEQ) | Self-report | Adults and research participants exploring affective empathy and their typical emotional responses to other people | 16 | The Toronto Empathy Questionnaire focuses on emotional responses to other people. |