Garfield’s Law of Concentration generalized Bradford’s insights concerning specific fields to all fields of science and demonstrated the existence of a multidisciplinary core set of journals, then as few as 1,000. His decision was informed by Bradford’s Law of Scattering ( Bradford, 1934) as well as his own research on SCI data that revealed Garfield’s Law of Concentration ( Garfield, 1971, 1972). Computing power increased and digital dissemination reduced expenses, but selectivity remained a hallmark of coverage because Garfield had decided early on to focus on internationally influential journals. With the earliest versions of the SCI, journal selection was constrained by cost considerations, including computation and printing.
Selectivity in coverage has long characterized the SCI, SSCI, and A&HCI, which were combined and launched on the World Wide Web as WoS in 1997.
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