"Transforming Science Assessment: Systems for Innovation," is a series of resources designed to provide state education leaders with: (1) Information about how states are currently pursuing statewide assessment systems in science; (2) Analyses of what features influence different approaches, with an eye to supporting state leaders as they make their own decisions regarding science assessment systems; (3) Detailed state profiles that highlight how and why some states have made decisions regarding designing and enacting different examples of systems of assessment; and (4) A how-to guide for policymakers looking to enact systems of assessment in science. This resource discusses two models that are emerging as common approaches to distributed assessment systems: those that are supported by the state and those that are supported by partner organizations.