INDIANAPOLIS (AP) — A group of Indiana teachers says requiring teachers to use two sets of education standards will disrupt learning for students.

Members of the group Stand for Children delivered a letter Tuesday to Indiana School Superintendent Glenda Ritz asking her to support the national Common Core education standards.

The state has halted implementation of the Common Core standards pending a review this summer by Indiana lawmakers. Some conservatives say Common Core interferes with local control of education.

Ritz recently sent a memo to schools saying both Common Core and the old Indiana Academic Standards should be used next school year. She wasn’t in her office when the teachers delivered the letter.

Teachers Seria Walton says the Indiana Standards require too much rote memorization while Common Core teaches students to actually think.