The method used to collect data depends on the desired data.
The collection of data is the most essential step in the process of research. The value, authenticity, and evaluation of a research or project will most importantly depend on the qualitative as well as quantitative methods of data collection that we have used.
While collecting data, the scientist has to keep in mind the purpose of his/her research, the most appropriate and reliable methods for data collection as well as the advantages and limitations of a certain method. Hence, the data collection method for any type of data depends on our purpose behind that research and is designed according to it.