We can apply this notion of saturation to Watts’s model of learners' conceptual frameworks for understanding force (see Chapter 3). Watts did not claim to be using GT, and acknowledged that his study produced a model suitable for further testing. He claimed his results had similarities with the findings of other studies, but this in itself cannot be seen as strong evidence for the value of his findings. A reader of the research is likely to look for evidence that the model produced is both an authentic reflection of the data collected (i.e., the analysis is careful and comprehensive and that the findings re likely to be of wider relevance. In this regard, Watts' paper shows that he based his model on a sample of 12 students of a range of ages in several schools in London, England (see Table 4.3) 15