In a __________ classroom teachers adapt their pedagogy and vary assessment to…

Concept: Progressive education is a philosophy of teaching in which curriculum, instructional methods, and assessment are kept flexible and are adapted to each learner's individual interests, pace, and developmental needs, rather than delivering the same content and method to every student uniformly. This idea is associated with educational thinkers such as John Dewey and underlies what is today called learner-centred or differentiated instruction.

Application: The stem describes a classroom where teachers change their pedagogy (teaching method) and vary their assessment to suit individual students. This is precisely the defining feature of the progressive approach described above — flexibility of method combined with individualised assessment — so the blank is filled by "progressive".

Cross-check — why the other approaches do not fit:

• teacher-centric: instruction is directed and controlled by the teacher, with content and pace delivered uniformly to the whole class rather than varied per student.

• textbook-centric: the sequence and content of lessons are fixed by the prescribed textbook, applied the same way to every student rather than adapted individually.

• behaviouristic: teaching is organised around a standard reinforcement/reward-punishment procedure applied uniformly to shape behaviour, not around individualising method or assessment.

None of these three involve adapting pedagogy and assessment to the individual learner, so "progressive" is the value that correctly completes the blank.