Table. 3.

Participants of in-depth interviews.

Composition Features Region
P teacher Head teacher of science-intensive high school, author of elective textbooks Seoul
H teacher Head teacher of school curriculum, and autonomous public high school Gyeonggi
Y teacher Research school for high school credit system Seoul
S teacher Research school for high school credit system Gwangju
C teacher Author of elective textbooks Sejong
New Phys.: Sae Mulli 2021;71:864~878 https://doi.org/10.3938/NPSM.71.864
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