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Approaches such as Peer Instruction (PI) have resulted in improved conceptual understanding. PI engages students in discussion at the conceptual level and focuses their attention on explanation and reflection. The Distributed Active Learning and Interactive Technology Environment (DALITE) is a virtual learning environment, conceived from principles of PI. We report on this design-experiment and the ongoing efforts to improve DALITE's functionality for instructors as well as its impact on student's conceptual learning.