Christy E. answered 04/16/19
Experienced High School Tutor Specializing in English
I would say pedagogy. Here's why:
Content makes up curriculum and assessments are the way teachers evaluate the students' understanding of that content. Pedagogy is the theory and practice of teaching - it's at the root of everything a teacher does in their classroom.
Pedagogy is going to be what shapes the way a teacher presents curriculum, builds content, and uses assessments.