Some methodologies are said to be emergent, meaning that it is not possible to plan the research in detail at the start, as the researcher has to be responsive to what is being learnt as the research proceeds. Indeed, in a “grounded theory” approach (discussed below ) it is totally inappropriate to set out a definite account of a research schedule and the data to be collected at the outset, and the flexibility within the design is seen as a strength as well as an essential part of the methodological approach. In such research, the techniques used (tactics) may be modified during the research. In such research, but only within the overall coherent methodology (strategy)