The Gießen Personality Questionnaire (German: Gießen-Test, GT) was developed at the University of Gießen in Germany and first published in 1972. It is a multidimensional personality inventory used to assess various aspects of personality. The methodology includes 40 questions and evaluates six core personality scales:
- Social Approval Scale (Soziale Extraversion - SE) – the ability to successfully interact with the environment and the subjective perception of one's social role.
- Dominance Scale (Dominanz - D) – power and influence versus submission and compliance as psychosocial defensive behaviors.

- Control Scale (Kontrolle - K) – the capacity for self-control and the degree to which it is manifested (from relaxation to rigidity).

- Basic Mood Scale (Grundstimmung - GS) – emotional background and ways of dealing with internal conflicts (aggression directed inward or outward).

- Openness – Reticence Scale (Offenheit - Abgeschlossenheit - OE/A) – the degree of openness toward others and the formation of basic trust.

- Social Capacity Scale (Soziale Potenz - SP) – the degree of personality maturity, the capacity for active social interaction, and emotional richness.

In addition to the core scales, the questionnaire includes two validity scales that allow for the analysis of the response selection pattern:
- Median Response Scale (M) – designed to evaluate the response pattern by reflecting the frequency of selecting the neutral position.

- Extreme Response Scale (E) – designed to evaluate the response pattern by reflecting the frequency of using the most categorical evaluations.

The "I" Version is designed to study an individual's self-esteem, revealing how a person perceives their own qualities and behavior. It helps identify key features of self-perception and the discrepancies between the current and ideal "Self," which is essential for understanding self-attitude and development potential.