Coding categories	Abbreviation
Category 1: Student-teacher interactions	STI
Category 2: Students’ self-expression	SS
Category 3: Second language writing instruction	SLWI
Category 4: Language development	LD
Category 5: Writing improvement	WI
Category 6: Peer comparison	PC
Category 7: Emotional satisfaction	ES
Category 8: Heavy workload	HW
Category 9: Inadequate comments	IC
Category 10: Unclear policy	UP
Category 11: Ineffective communication	ICN
Coding themes	Abbreviation
Theme 1: Influencing factors of students’ preferences	IFSP
Theme 2: Perceived benefits from the WCF	PB
Theme 3: Perceived challenges from the WCF	PC