Design Principles Database (DPD)!
Whether you are an educational technology researcher, a learning scientist, a designer of web-based learning materials, or a teacher using technology, the DPD is a place for you to learn from the wisdom gained by dozens of researchers who have designed, enacted with students, and studied the use of technology for learning. This wisdom is translated in the DPD into pedagogical Design Principles at three grain-size levels, exemplified with Design Features.
Source: Design Principles Database
