In Maryland, we hope to be funded by a grant that will allow us to write a K-5 computer science curriculum to address the Computer Science Teachers Association (CSTA) K-12 Computer Science standards. This board and the web have useful information for middle school and high school computer science, but more best practices are needed in the elementary school arena.
We are finding sufficient resources regarding the Programming and Algorithms concept, but there are fewer resources for the Computer Systems concept. If you use robotics or microcontrollers (Makey/Makey, Arduino, Micro:bit), share your evaluation of whether these are developmentally appropriate at the grade you used them, and how you aligned your instruction to the Computer Systems concept. If you used other technologies to make the concept more concrete, what technologies did you use?