AUSTIN, Texas (AP) — Top education leaders in the state Senate on Thursday grilled the creators of a curriculum system used across Texas that critics claim promotes anti-American values and stifles classroom flexibility.

CSCOPE is an electronic curriculum management system that offers Web-based lesson plans and exams designed to help teachers adhere to state educational requirements. It is now used in 875 school districts — more than 70 percent of districts statewide — and is supposed to be flexible enough for teachers to alter content to meet their individual needs.