Florian Znaniecki

The supreme importance of classification in science has remained unacknowledged for a long period … every classification is already a theory

he must be sure that his final use of the term be very different from its popular use; if it is not, there is a strong presumption that his research has been as superficial as common-sense reflection

analytic induction ends where enumerative induction begins; and if well conducted, leaves no real and soluble problems for the latter