It also harms parents that only have a small amount of time to help their child with homework by pulling the rug out from under them. The parent's own knowlage

It also harms parents that only have a small amount of time to help their child with homework by pulling the rug out from under them. The parent's own knowlage is no longer of any use. I have enough time to get the nuance of common core and help my child but plenty of others don't have that luxury of time.