Good hypotheses stem from repeated, objective observations.
The quality of the hypothesis determines the feasibility of experimentation. Conclusions or claims that stem only or preferentially from data consistent with preconceived notions are not credible. Any credible theory must be consistent with all relevant data. Often, opinions are acceptable expedients to filling informational gaps. If the study proceeds without a clear-cut definition, the resulting count could include creatures the researcher had not intended to be tallied, such as humans or protozoans.