By Dr. Marciene Mattleman

PHILADELPHIA (CBS) – Policy makers, educators and those concerned about the quality of education across the country have heralded the Common Core as a way of ensuring standards in schools nationwide. Almost every state signed on. But Oklahoma is an example in which legislation has been passed to repeal the standards and Missouri and South Carolina are moving in that direction, as well. Indiana has already undone its adoption.

READ MORE: Police Investigating Quadruple Shooting In Southwest Philadelphia: Sources

In Oklahoma rejection is built on fears of federal overreach, of threatening a waiver from the No Child Left Behind Act.

READ MORE: Temple University Student Samuel Sean Collington Killed In Off-Campus Shooting In North Philadelphia

Concerns elsewhere mention lack of professional development for teachers and finding appropriate instructional material – no longer just opening a textbook.

But since the standards are in place, dissatisfied districts are concerned about further disruption since core implementation has begun.

MORE NEWS: 'The Whole World Is Going To See It': Art From Nebinger Elementary Students To Be Featured On National Christmas Tree

A report in Education Week mentions some of the problems.