Search	Terms	Results
S1	(“class size”) OR class size* OR class near/2 size*	1690
S2	((“class size”) OR class size* OR class near/2 size*) OR (((“classroom environment”) OR classroom environment* OR classroom near/1 environment*) OR ((“crowding”) OR crowding*)) OR ((flexible NEAR/1 scheduling* OR (“flexible scheduling”)) OR (“small classes*” OR small NEAR/1 classes*))	3423
S3	((“primary schools”) OR primary school* OR primary NEAR/1 school*) OR (((“elementary school students” OR “elementary schools”) OR elementary school* OR elementary NEAR/1 school*) OR ((“secondary schools”) OR secondary school* OR secondary near/1 school*)) OR (((“middle schools”) OR middle school* OR middle near/1 school*) OR ((“junior high schools” OR “junior high school students”) OR junior high* OR junior near/1 high))	13820
S4	((“learning”) OR learn*) OR (((“development”) OR develop* OR child development*) OR ((“performance”) OR perform*)) OR (((“achievement”) OR achieve*) OR ((“intellectual ability” OR “ability”) OR intelle* near/2 abili*)) OR (((“outcomes”) OR outcome*) OR ((“improvement”) OR improve*))	639914
S5	(school NEAR/1 (performan* OR achiev*)) OR (((“intellectual development”) OR intellectual near/1 development*) OR (intelle* near/2 develop*))	2516
S6	((school NEAR/1 (performan* OR achiev*)) OR (((“intellectual development”) OR intellectual near/1 development*) OR (intelle* near/2 develop*))) OR (((“learning”) OR learn*) OR (((“development”) OR develop* OR child development*) OR ((“performance”) OR perform*)) OR (((“achievement”) OR achieve*) OR ((“intellectual ability” OR “ability”) OR intelle* near/2 abili*)) OR (((“outcomes”) OR outcome*) OR ((“improvement”) OR improve*)))	639924
S7	(((school NEAR/1 (performan* OR achiev*)) OR (((“intellectual development”) OR intellectual near/1 development*) OR (intelle* near/2 develop*))) OR (((“learning”) OR learn*) OR (((“development”) OR develop* OR child development*) OR ((“performance”) OR perform*)) OR (((“achievement”) OR achieve*) OR ((“intellectual ability” OR “ability”) OR intelle* near/2 abili*)) OR (((“outcomes”) OR outcome*) OR ((“improvement”) OR improve*)))) AND (((“primary schools”) OR primary school* OR primary NEAR/1 school*) OR (((“elementary school students” OR “elementary schools”) OR elementary school* OR elementary NEAR/1 school*) OR ((“secondary schools”) OR secondary school* OR secondary near/1 school*)) OR (((“middle schools”) OR middle school* OR middle near/1 school*) OR ((“junior high schools” OR “junior high school students”) OR junior high* OR junior near/1 high))) AND (((“class size”) OR class size* OR class NEAR/2 size*) OR (((“classroom environment”) OR classroom environment* OR classroom near/1 environment*) OR ((“crowding”) OR crowding*)) OR ((flexible NEAR/1 scheduling* OR (“flexible scheduling”)) OR (“small classes*” OR small NEAR/1 classes*)))	189