Although the collection of data from all contexts is challenging for research, a sample must be chosen. The whole set of cases from which the sample of the researcher is taken is called the population. Because researchers do not have the time or resources to evaluate the population as a whole, they use sampling techniques to decrease the number of cases.

The researcher uses the set of components to determine the target population sample and is therefore known as a sampling frame. Trying to take a subsection of the selected sampling frame or population as a whole is known as sampling. Sampling techniques can typically be classified into two forms:

- Random sampling or Probability
- Non- random sampling or Non- probability

A sampling frame is required in a certain type in probability sampling methods.; thus, they often absorb more time than the non-probability method that cannot depend on the logic of probability hypotheses. (Saunders, Lewis and Thornhill, 2016). Furthermore, the non-probability method is not used to extract and deviate from the sample to the population. The research has been done in Yangon.

Figure 3.1 Sampling Process Steps

Source: Hamed Taherdoost (2016)

Figure 3.2 Sampling Techniques

Source: Hamed Taherdoost (2016)