Where should “learning engineers” draw their principles from?

Many folks are seeking inspiration for their approaches to learning (new and old) from results that are emerging about how the brain works. Inspiration can come from anywhere, of course – but when you're building “real stuff” that's supposed to work in the world at scale (“learning engineering” we might say), the best sources for evidence-based principles to guide design success are likely to come from cognitive science, not (yet) lower level research from neuroscience and brain science.