Madison School District PDF:

#1: Good teaching needs to be seen as including those students who are already grade-level proficient
– Lesson plans (coherent instruction) – Curricular alignment
– Accountability
#2 Needs-Based Learning
• What a student is learning should be based on his or her current level of mastery
• This may or may not correspond with age-level norms

This would seem to make sense for all students.
Related: Some states begin to add teacher content knowledge requirements to the licensing process.
Much more on Madison’s Talented & Gifted program along with a recent parent complaint.