The document describes design-based research and narrative ecology as a design experiment. It discusses how design-based research is carried out to explore how technological innovations affect learning and interaction. The goal is to engineer innovative learning environments while understanding aspects of human cognition and learning. Characteristics of design experiments are that they are mediated by technology, embedded in social contexts, can test new learning paradigms, and create scientific understanding of learning. Challenges include complexity, large amounts of data, and comparing across designs.