other sampling methods. It is a very complicated method and not easy to understand. To achieve depth in developing the categories researcher proceeds to another location to increase breadth in the category which sounds very complex and indeed is not helpful for the novice and may be problematic. Key features While discussing theoretical sampling, there are three features that must be considered: 1. Choosing cases in terms of the theory In this feature, the basis is constructed on an ideal universe or a wider universe where there is a larger comprehension or social explanation according to which the researcher is able to construct their theory. This theoretical universe will allow for better-formulated samples which are more meaningful and sensible than others. This kind of sample will also be a wider representative sample. So in this type of sampling, we select samples that have a particular process, examples, categories and even types that are relevant to the ideal or wider universe. One of the most commonly given example is of discourse analysis of gender. The sample relevant units in qualitative research are very often viewed as theoretically defined. This basically means that attributes such as gender, ethnicity and even age can't be the basis for a sample. This is due to the fact that most often attributions are themselves the topic of the research. 2. Choosing deviant cases One of the leading philosophies in theoretical sampling is the fact that the researcher doesn't choose cases that are supportive to their argument. In theoretical sampling the belief is that researchers need to overcome the tendency to select cases and instances that support their side of the argument. Instead it states that it would be more beneficial to look out for negative instances and cases which are defined by the theory that we are working with. This feature basically states that a researcher should not exclude any fact from the process of research just because it seems impossible. Researchers should insist on the fact that if they imagine it then it can't be impossible. 3. Changing the size of your sample during the course of the research The first two features of a theoretical sample deals with issues right at the beginning of the research project. The third feature however deals with concerns or application during the process of the research. One of the advantages the qualitative research as a whole has over