In the study the writers chose random sampling as the main avenue of interviewing participants in order to obtain their primary data. They had twenty respondents in the three different age-groups. The form of data collected was quantitative. Quantitative data is good since empirical tests or data analysis can be comfortably computed on the data.
Since the study was cross-sectional the main aim was to show that children become more reflective as time goes or as they grow older. According to the writers it was necessary to show that much of this reflection was verbal in nature. According to the study we have come to realize that although young children engage in inner speech, they engage in it less or differently from older people. According to Hitch and others, 1991 young children engage in inner speech while doing some form of covert verbal encoding. In addition the study shows that preschoolers engage in sub vocalization.