Incompatibility thesis in is an argument in research methodology about incompatibility of quantitative research

Quantitative research

In the social sciences, quantitative research refers to the systematic empirical investigation of social phenomena via statistical, mathematical or computational techniques. The objective of quantitative research is to develop and employ mathematical models, theories and/or hypotheses pertaining to...

 and qualitative research

Qualitative research

Qualitative research is a method of inquiry employed in many different academic disciplines, traditionally in the social sciences, but also in market research and further contexts. Qualitative researchers aim to gather an in-depth understanding of human behavior and the reasons that govern such...

 paradigm

Paradigm

The word paradigm has been used in science to describe distinct concepts. It comes from Greek "παράδειγμα" , "pattern, example, sample" from the verb "παραδείκνυμι" , "exhibit, represent, expose" and that from "παρά" , "beside, beyond" + "δείκνυμι" , "to show, to point out".The original Greek...

s in the same research. This thesis is based on philosophies of post-structuralism

Post-structuralism

Post-structuralism is a label formulated by American academics to denote the heterogeneous works of a series of French intellectuals who came to international prominence in the 1960s and '70s...

 and post-modernism (among others). Arguments from those philosophies support exclusive superiority of one orientation (usually, the qualitative one) are oppose mixing it with quantitative research (as is advocated by the proponents of mixed-method research who support the compatibility thesis).