Q Method: Assessing Subjectivity Through Structured Ranking of Items
S. Leidig, H. Köhler, C. Caruso, M. Goller, in: M. Goller, E. Kyndt, S. Paloniemi, C. Damfa  (Eds.),  Methods for Researching Professional Learning and Development: Challenges, Applications and Empirical Illustrations, Springer , Cham, 2022, pp. 441–466.