What it means for curriculum materials to be “coherent pedagogically, logically, and conceptually”

What do you think it means for curriculum materials to be “coherent pedagogically, logically, and conceptually” (Larson, 2016)? Why is this important?
In some schools, teachers are expected to use a variety of programs (e.g., online tutoring programs) and curriculum materials (e.g., the adopted textbook; supplemental materials). Do you think that it is beneficial for students to use different resources? Or would it be better for the curriculum materials to be consistent? Why?

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