The most important role in the academic lives of ELL students is that of the ELL teacher. Linguistically diverse students thrive in classrooms led by teachers who not only recognize the specific learning needs of these students, but also have a rich repertoire of ELL-sensitive teaching strategies to ensure that these needs are appropriately addressed. A common challenge in many schools serving ELL students is the limited access to teaching tools, materials, and strategies that help teachers elicit and collect meaningful evidence of student learning. Importantly, teachers often lack the training and opportunity to establish a system of routines and practices supporting interpretation of evidence of learning to monitor their students’ learning and subsequently address emerging needs of ELL students through targeted instructional planning. To help support teachers’ efforts in this respect, we have compiled a collection of tools and resources to help guide teachers of ELL students in implementation of linguistically and culturally sensitive teaching practices, supporting the unique needs of ELLs.