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Authors
Haase Formánková, Zuzana
Jarabinský, Ivan
Líbal, Miroslav
Oreský, Jan
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Article History
Received: 31 August 2025
Accepted: 26 November 2025
First Online: 21 January 2026
Declarations
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: Karel Janeček, the founder of Institute H21 where the authors are currently employed, is also the creator of the D21 method. This method is one of the subjects of examination within the present research paper. The authors emphasize that the research was conducted with objectivity, and the results are presented without bias.
