For journals in Web of Science core, there are 4 indexes:
– Science Citation Index Expanded (SCIE): clinical, natural and applied sciences
– Social Sciences Citation Index (SSCI): social sciences
– Arts & Humanities Citation Index (AHCI): arts and humanities
– Emerging Sources Citation Index (ESCI): all disciplines
Journals that meet the quality criteria enter Emerging Sources Citation Index (ESCI). Journals that meet the additional impact criteria enter Science Citation Index Expanded (SCIE), Social Sciences Citation Index (SSCI) or Arts & Humanities Citation Index (AHCI) depending on their subject area.