Districts provide teachers with pacing guides to help ensure they stay on track throughout the school year. What are some consequences of teachers not following the pacing guide?

Districts provide teachers with pacing guides to help ensure they stay on track throughout the school year. What are some consequences of teachers not following the pacing guide? As the curriculum director of a school, how would you ensure teachers are staying on pace? How do you plan to approach a teacher who continually falls behind or speeds ahead?