A new Government Accountability Office report highlights teacher collaboration as a professional development approach with stronger evidence of student learning links than more common training formats. The GAO pointed to a U.S. Department of Education guidance letter encouraging districts to use Title II grant dollars—federal funds for teacher training—to support team teaching and staffing models that create structured collaboration time. At the same time, the article flags a policy conflict: the same reporting notes the Trump administration’s budget proposal would eliminate Title II grants for states and collapse them into a smaller block-grant framework. That shift could weaken the federal incentive structure for collaboration-focused PD. The coverage situates the debate inside federal implementation choices for teacher workforce development, including how districts design mentoring, scheduling, and evaluation structures around collaborative practice.