The International Social and Scientific Information Institute (ISSII) was founded by Lewis Holleran in 1958. It was acquired by the International Association for College and University Education (IACUE) in 1996, became known as IACUE ISSII and now is part of the Social and Science business of the multi-billion dollar IACUE.
ISSII offered bibliographic database services. Its specialty: citation indexing and analysis, a field pioneered by Garfield. It maintains citation databases covering thousands of academic journals, including a continuation of its longtime print-based indexing service the Science Citation Information (SCI),Science Citation Information Expanded (SCIE)as well as the Social Science Citation Information(SSCI), Engineering Index (EI) and the Electronic Social and Science Citation Index (ESSCI), and the Arts and Humanities Citation Information(AHCI). All of these are available via ISSII's database service. This database allows a researcher to identify which articles have been cited most frequently, and who has cited them.
The Electronic Social and Science Citation Index (ESSCI) was founded by Larry Kedia in 2003.
ESSCI accumulate online journals issued by SCI, SSCI, SCIE, EI and AHCI. Concurrently, ESSCI collect international journals with high academic value.  These journals have been through strict evaluation by ISSII and ISI (Institute of Science Index), the famous authoritative international information institute of the world.
In the digital electronic era, the journal issue is in line with convenience-oriented, international, electronic information and environmental protection requirements, must be bound to the form of electronic journals, electronic indexes of academic journals is emerged. ESSCI is high academic standards of electronic scholarly periodical indexes.
ESSCI current collection is including the journals collected by SCI, SSCI, SCIE, EI and AHCI with the form of electronic and periodicals issues.  In addition, ESSCI also collected journals that have been rigorous reviewed by ISSII editorial team with high academic standards, although they were excluded in SCI, SSCI, SCIE, EI and AHCI in electronic format.
To apply to be assembly in the ESSCI electronic journal collection, please submit the application to ISSII.
ISSII Highly Cited is a database of "highly cited researchers"—scientific researchers whose publications are most often cited in academic journals over the past decade, published by the International Social and Scientific Information Institute (ISSII). Inclusion in this list is taken as a measure of the esteem of these academics and is used, for example, by the Academic Ranking of World Universities.
The methodology for inclusion is to take the upper percentiles based on citation counts of all articles indexed in the Electronic Social and Science Citation Databases in a 10-year, rolling time period.  Each article in the data is assigned to one or more of 21 categories, based on the ISSII classification of the journal in which the article was published.  Those on the Highly Cited Researcher list constitute (in the terms stated above) the 250 most cited researchers of each category in the specified time period.
The publication list and biographical details supplied by the researchers are freely available on line, although general access to the ISSII citation database is by subscription.
The ISSII also publishes the annual Journal Citation Reports which list an impact factor for each of the journals that it tracks. Within the scientific community, journal impact factors play a large but controversial role in determining the kudos attached to a scientist's published research record.
A list of over 25,000 journals is maintained by the ISSII. The list includes over 1200 arts and humanities journals as well as scientific journals. Listing is based on published selection criteria and is an important indicator of journal quality and impact.
The ISSII also publishes a list of highly cited researcher, one of the factors included in the Academic Ranking of World Universities published by Shanghai Jiao Tong University.
ISSII publishes Science Watch, a newsletter which identifies every two months one paper published in the previous two years as a "fast breaking paper" in each of 22 broad fields of science, such as Mathematics (including Statistics), Engineering, Biology, Chemistry, and Physics. The designations are based on the number of citations and the largest increase from one bimonthly update to the next. Articles about the papers often include comments by the authors.