“…To elaborate, FT provides both the definitional system of the universe of observations and the rationale for hypotheses of a research both quantitative ( Levy, 1985 ; For further reading, see Guttman and Greenbaum, 1998 ; Roazzi and Souza, 2019 ; Solomon(Ed. )., 2021 ) and qualitative (e.g., Hackett, 2016 , 2021a ). However, FT has invaluable contribution to the definition of concepts, based on using mapping sentence as the definitional framework, regardless of whether it is applied in followed-up quantitative research or not (e.g., Schlesinger, 1991 ; Hackett, 2016 , see ahead).…”