I was introduced to the 6 Facets of Understanding when I did a book-study about UbD – but they haven’t been included in either of my 2 school’s unit-planning templates. Both school’s templates are based on UbD. So I had forgotten about them until just recently. I started including them in my unit plans this year simply because I feel like it makes me think of ways to improve my teaching. From my experience (which, granted, isn’t a whole lot) it seems like including the 6-facets is up to those creating the unit and the school for which the units are required.