Teachers’ learning communities enable the school curriculum diversified and specialized, and act as a mechanism
that develops individual teachers’ professionalism. For all their importance, it’s hard and requires a lot of time and effort
to establish and maintain teachers’ learning communities. Recently, some ‘Innovation Schools’ in Seoul and Gyeonggi-do
areas have established teachers’ learning communities at the school level through cross-curricular instructional communities
where teachers discuss and consult their classes. Unlike existing subject-based instructional consulting at the secondary
school, cross-curricular instructional communities develop activity sheets and plans together with various subject teachers at
the same school before holding the class for all. In this research, based on case studies, we explored the characteristics of
cross-curricular instructional communities. According to the results, cross-curricular instructional communities feature codeveloping
activity sheets and plans in advance of open classes rather than after-class consulting, and overcoming the limitations
of subject-specific consulting by examining instructional planning with various subject teachers from various angles
rather than researching the same subject class with the same speciality. In cross-curricular instructional communities, teachers
figure out students’ responses in advance, conduct pilot classes based on discussion results, and aim to develop interactive
activity sheets and instruction where students learn collaboratively. Discussed in the conclusion are future directions of crosscurricular
instructional communities including final decision makers in the community, opportunity to reflect one’s own subject
teaching, improvement of teachers’ perspectives to observe classes, and so on.