Creativity refers to the human processes that underpin sublime forms of expression and fuel innovation. Creativity support environments (CSEs) address diverse areas, such as education, science, business, disaster response, design, art, performance, and everyday life. A CSE may consist of a desktop application, or use specialized hardware, networked topologies, and mobile devices. CSEs may address temporal-spatial aspects of collaborative work. This workshop gathers a community of researchers developing and evaluating CSEs. We will share approaches, engage in dialogue, and develop best practices. The outcome is not a single prescription, but an ontology of methodologies with consideration to how they map to creative activities, and an emerging consensus on the range of expectations for rigorous evaluation to shape the field of CSE research. The workshop will organize an open repository of CSE evaluation methods and test data.