Thank you, Martin, for doing what it takes to get it right. This is a project with huge potential and it's foolish to think it would be perfect the first time out. As I wrote in 2015 shortly after I started working in earnest on OER curriculum (I had created one simple OER unit four years earlier) "The big value will be the community of teaching and learning that gets created in the process of sharing notes and stories about how the lessons worked. The curriculum I curate is just a beginning. It will be revised and improved upon, I hope, every time another teacher uses it. Revising and improving is the whole point of OER and, as you know, open source software.