Requirements for a Good Research Design:
a. Nature and scope of the problem to be studied must be stated clearly or say must be well defined and formulated.
b. If any hypothesis is to be tested it must to clearly formulated.
c. The research design must adequately answer the research questions. And test the hypothesis.
d. Relevant variables must be clearly identified and operational zed. Adequate methods of collecting the information and methods of logically deriving the conclusion must be developed. Only then control of variance is possible.
e. The research design must be structured in a manner that it fulfils the need of internal and external validity.