In view of the stated research design decisions, the overall research design may be divided into the following (Kothari 1988):
A. The sampling design that deals with the method of selecting items to be observed for the selected study
B. The observational design that relates to the conditions under which the observations are to be made
C. The statistical design that concerns with the question of how many items are to be observed, and how the information and data gathered are to be analysed
D. The operational design that deals with the techniques by which the procedures specified in the sampling, statistical and observational designs can be carried out.