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The first relevant attempt to describe mixed methods (MM) in the field of evaluative research is attributable to Greene and Caracelli (1997). The authors distinguish various forms of MM starting from the purposes for which they are used. Since 1997 important developments occurred in academic and professional debates related to MM in evaluative research. Starting from the reconstruction of the debate on the usefulness and use of MM in evaluative research, this paper reflects on the ontological, epistemological, methodological, and axiological issues related to the evaluative research processes using MM. This consideration needs to involve an extended vision of the issues underlying the choices of specific methods in the research process. This is even more necessary in evaluative research that constitutionally engages with complex dilemmas, especially on the axiological level. [ABSTRACT FROM AUTHOR]