Web‐source	Search	Terms	Limiters	Hits
What Works Clearinghouse ‐ U.S. Department of Education	1	class size*	Reviewed Studies	2
	2	small class*	Reviewed Studies	3
	3	classroom environment*	Reviewed Studies	12
edu.au.dk ‐ clearinghouse	1	class size*	Publikationer	85
European Educational Research Association	1	class size*		26
American Educational Research Association (AERA)	1	class size*		205
Social Science Research Network (SSRN)	1	class size*	Title, Abstract, Abstract ID & Keywords	762
	2	“class size”	Title	60
	3	“class size”	Title, Abstract, Abstract ID & Keywords	154