Abstract: | A psychometric study has been conducted with the aim of testing the validity of the Formal Characteristics of Behaviour—Temperament Inventory (FCB—TI). FCB—TI has been constructed to measure six temperament traits according to the Regulative Theory of Temperament (RTT): Briskness, Perseverance (referring to the temporal aspect of behavior), Sensory Sensitivity, Emotional Reactivity, Endurance, and Activity (referring to the energetic characteristics of behaviour). These traits have been compared with other temperament as well as personality dimensions. The following measures were used: PTS, EAS—TS, DOTS—R, EPQ—R, SSS—V, 16PF, and NEO-FFI. The study was conducted on samples consisting of over 1500 subjects with satisfactory balanced gender ratio (about 50 per cent), and with a broad range of age (from 15 to 77 years), representing a variety of professions and educational levels. The correlational and factor analytic findings are presented; these show high theoretical validity of the FCB—TI scales, except the Sensory Sensitivity scale. In the discussion some conclusions concerning the revision of the structure of temperament have been suggested. |