Qualitative data analysis. As for qualitative phase of the study, both descriptive and interpretive document analysis techniques were used to analyze student products. Document analysis involves the analysis of written or visual material about the construct or constructs under scrutiny (Yildirim & Simsek, 2013). Manifest and latent document analysis techniques should be used together because descriptive document analysis enables the researcher to describe what is present in the documents, but this should be supported with interpretive document analysis techniques to reach the underlying meaning of the documents (Berg, 2001). Additionally, coding technique, which helps the researcher to get more comprehensive results (Neuman, 2014), is used to interpret the documents. To increase the reliability of qualitative analysis and minimize researcher subjectivity, two other experts went over the codings and the analysis of the data