The Center for Advanced Research on Language Acquisition (CARLA) provides a wealth of support and resources on assessment in the language classroom. The CARLA Virtual Assessment Center is a series of online modules that provide language teachers with background, step-by-step guidance, supports, and resources for creating assessments using backwards design that align to the National WL Standards and Can Do Statements.
Check out an image of all of the modules available:
Make sure also to check out the CARLA Virtual Item Bank. This resource will provide you with great ideas for performance-based assessments for every proficiency level and every language domain.