e: Topic 3 DQ 2McNiff and Petrick (2018) state that population or sample. At this point the researcher determines the appropriate research subjects to study ethically and appropriately, taking into consideration inclusions and exclusion criteria. Sampling theory was developed to help determine the best way for acquiring a sample for the specific population that is being researched. It essentially provides a framework for generalizing samples to corresponding populations and can be most generalized when relating to populations and settings that can be itemized (Matt & Sklar, 2010). These authors help explain the complexity of sampling theory and generalization is vastly discussed. One question they state in their article is “If sampling theory is not often used or is not able to answer important generalizability questions, how should we justify the external validity of causal relationships? “ ( Matt & Sklar, 2010, para. 1).“The generalizability of a study's results depends on the researcher's ability to separate the “relevant” from the “irrelevant” facts of the study, and then carry forward a judgment about the relevant facts,2which would be easy if we always knew what might eventually turn out to be relevant (Kukull & Ganguli, 2012, para.4). Generalization is essentially the big picture of the study’s results once it is deemed valid. Additionally, it is basically how useful the result of a study is in a broader situation or population. Polit and Beck (2010) state that there are three types of generalization: classics statistical, analytic, and case-to-case transfer model. All of which have relevance to nursing research. Without generalization, there would not be evidence-based practice. Both qualitative and quantitative research either help patient practice be better or helps distinguish myths.