A good scientist creates a theory by carefully studying existing empirical evidence and using logic to form new ideas. Is Parsimonious Parsimony means explaining theories in the simplest terms. If there are two theories that both explain a phenemena, the simpler and more straightforward theory is preferred. Likewise, one theory that explains a set of phenomena is preferred over several theories that also explain the set of phenomena. Simple is better.
Good theories are the hallmark of any science.