Abstract
Introduction. Phenomena such as openness to the world, flexibility in changing one’s 
existential beliefs and worldview, and the ability to ask oneself complex questions are 
of both epistemological and psychological interest. Van Pachterbeke et al. refer to this 
readiness to engage in questioning as existential quest. Their proposed construct allows 
for assessing an individual’s readiness to change their fundamental beliefs related to 
existential questions and worldview. The Scale of Existential Quest is a reliable tool for 
research abroad but has not been used in Russian psychology. The aim of this study is 
to test and validate the Scale of Existential Quest on a Russian-speaking sample as a tool 
for determining openness to changing one’s existential beliefs. Methods. The adaptation 
of the scale was carried out in several stages. At the first stage, the scale was translated, 
and its content validity was assessed through expert evaluation (16 experts). At the 
second stage, the internal reliability and convergent validity of the adapted scale were 
examined (177 participants). At the third stage (500 respondents), external and construct 
validity were evaluated. The following methods were used: NEO-FFI Questionnaire; 
UCLA Loneliness Scale; DASS-21 Depression Scale; The Death Attitude Profile Revised; 
Existential Concerns Questionnaire; Meaning in Life Questionnaire; Existential Isolation 
Scale. Results. The basic psychometric indicators of reliability and validity of the scale 
generally met expectations (content validity of all items was confirmed). Most of the 
expected correlations were highly significant, except for a significant correlation with 
«search for meaning in life» at the second stage, which can be explained by sample characteristics. The results of exploratory factor analysis at the second and third stages of 
the study revealed several factors in the scale, which, based on theoretical justification, 
is not plausible. The Appendix provides the finalized questionnaire ready for use. 
Discussion. The obtained data confirmed the validity of using the concept of existential 
quest as a measurable psychological construct.
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