Joining the Sides

I'm going to try and explain how to join the sides of two squares together using the method that I'm doing for this throw. I don't have a name for the method though. Here's what I'm doing. (check out my explanation for Edging the Squares first). I already have the black square edged. Now I'm working the edging on the white square and joining as I go. To join, after the corner has been worked, it's a sc, ch 2, sl st in the ch 4 loop of the black square, ch 2, sk 3 sc on the white square, sc in next stitch. My photos aren't the best (even using two different camera's) but hopefully you can see the explanation in at least one of them.