ABSTRACT
The theoretical sampling ideas were expanded by describing how a qualitative research sample aims to provide a meticulous view of a particular unit and cover a range of relevant units. Grounded theorising involves two inter-related processes called theoretical sampling and constant comparative analysis. The former refers to the data collection stage of the research and encourages the researcher to adapt the sample and the questions asked to test the robustness of the theoretical ideas as they emerge from the analysis. The latter guides the analysis by recommending that the researcher is always looking for exceptions to emerging theoretical ideas by constantly comparing them with other parts of the data set. The chapter expands the philosophy of sampling for grounded theorising, and describes the case study and sample selection. It provides the interviewee with a full selection of road pricing options on which to form opinions and to encourage the respondents to verbalise the opinions.
