To put forward valid and credible implications based on the studies of this research project; I had to do everything to ensure the quality of the research. Dörnyei (2007, p. 50) claimed that for quantitative studies, researchers should aim for 1) reliability, 2) measurement validity and 3) research validity. Reliability of the questionnaires was ensured by reliability analyses; Cronbach’s alpha and dimension analysis were run on each construct of both questionnaires, as the reliability of a construct in the learner questionnaire did not automatically mean that the same construct would be reliable as part of the instructor questionnaire. Measurement validity was tested by reliability analyses of the scales as well as by dimension reduction, more precisely, principal component analysis (Dörnyei & Csizér, 2012). Research validity concerns how the researcher conducted and reported on the research project; therefore, questionnaire constructs were designed based on the literature surveyed (Creswell, 2009; Dörnyei, 2003; 2007), and the findings are to be reported in detail without manipulating the instrument or the data collected. As an important and integral part of research validity, those constructs of the questionnaires that might not produce reliable results are excluded from the final analysis.