The Bill & Melinda Gates Foundation says it is “doubling down” on its efforts to help teachers adapt to the Common Core education standards.

“Far too many districts report that identifying or developing Common Core-aligned materials is a challenge, meaning that teachers spend their time adapting or creating curriculum, developing lessons, and searching for supplemental materials,” Gates Foundation CEO Sue Desmond-Hellmann writes in an open letter. “So, we’re doubling down on our efforts to make sure teachers have what they need to make the most of their unique capabilities.”