Self-understanding

Abstractedness(추상성): Imaginative versus practical

Apprehension: Worried versus confident

Dominance(지배성): Forceful versus submissive

Emotional Stability(정서적 안정성): Calm versus high-strung

Liveliness(정열성): Spontaneous versus restrained

Openness to Change(변화에 대한 개방성): Flexible versus attached to the familiar

Perfectionism(완벽주의): Controlled versus undisciplined

Privateness(불안): Discreet versus open

Reasoning(사고능력): Abstract versus concrete

Rule-Consciousness: Conforming versus non-conforming

Self-Reliance: Self-sufficient versus dependent

Sensitivity(민감성): Tender-hearted versus tough-minded.

Social Boldness(사회적 대답성): Uninhibited versus shy

Tension(긴장): Inpatient versus relaxed

Vigilance: Suspicious versus trusting

Warmth(온정성): Outgoing versus reserved

Life data (or L-data), which involves collecting data from the individual's natural, everyday life behaviors, measuring their characteristic behavior patterns in the real world. This could range from number of traffic accidents or number of parties attended each month, to grade point average in school or number of illnesses or divorces.
Experimental data (or T-data) which involves reactions to standardized experimental situations created in a lab where a subject's behavior can be objectively observed and measured.
Questionnaire data (or Q-data), which involves responses based on introspection by the individual about their own behavior and feelings. He found that this kind of direct questioning often measured subtle internal states and viewpoints that might be hard to see or measure in external behavior.