The Space Environment Testbeds (SET) Project performs flight and data investigations to address the Living With a Star (LWS) Program goal of understanding how the Sun/Earth interactions affect humanity. SET uses existing data and new data from the low-cost SET mission to define the mechanisms for space environment effects, reduce uncertainties in the environment and its effects on spacecraft and their payloads and improve design and operations guidelines and test protocols so that spacecraft anomalies and failures due to environmental effects during operations are reduced.