They decided to draw comparisons between the data collected from the questionnaires and the interviews because in doing so, they are able to prevent any flaws in collecting data which takes place when data is collected only from one source. The manner in which the data was analysed provided an illustration of the quantitative results using qualitative examples. They were also successful in gaining meaningful understanding of why the teachers answered in a way that was particularly directed to the constructed questions. There were no gaps in the data collected even if the researchers had to wait for more respondents. They managed to extend their window period, selected the completed questionnaires, segregated them according to their items or criteria of selection, sorted the teachers they wanted to interview based on variables they considered would help them understand the gap (of the area of research which in this case is Learner Autonomy and the lack of research conducted and availability of findings from previous research to understand the concept from an English language teacher's view) they raised in their research questions and used an instrument they created with extensive background theory to support their arguments.