Before conducting any diabetes research, the researcher must decide on the purpose, the duration, the cost, and finally the feasibility of the study.  If the researcher plans to conduct a pilot study, he does not need to design a complex study but rather a simple one that is cheap, easily accessible to the subjects and can be completed in a short period of time.  However, if the researchers are looking for a community based study.  The research should expect a high cost, a longer research time and poorer feasibility.