TABLE 1.

Characteristics of blacklists and whitelists included in the study

List	Maintenance	Access	Type(s) of journals and publishers	No. of journals	No. of publishers	Inclusion criteria used in analysis
Blacklists
Beall’s lista	Formerly performed by an individual scholarly librarian; now performed by an academic wishing to remain anonymous	Free	Standalone OA journals and OA publishers	1,404	1,205	54 criteria developed by Jeffrey Beall, based on statements from the COPE and WAME (http://www.wame.org/)
Cabell’s blacklist	Employees of a for- profit company	Subscription	OA and subscription- based journals and publishers (ratio, 3:1)	10,671	473	63 criteria
Whitelists
Cabell’s whitelist	Employees of a for- profit company	Subscription	OA and hybrid or subscription- based journals and publishers (ratio, 1:4)	11,057	2,446	38 criteria, not including criteria defining which disciplines are allowed in the list
DOAJ	Community of OA publishers with >100 volunteers and a core team of 15 people, employed by DOAJ's holding company, IS4OA	Free	OA journals and publishers	12,357	5,638	10 basic inclusion criteria, 14 principles of transparency, 15 additional recommendations, not including OA-specific criteria

^aUnlike the other lists, journals and publishers included in the two Beall’s lists are independent of each other. All lists were accessed on 13 December 2018.