Assessment doesn't mean test. It means demonstrate understanding. Just talking to Lightning Bug about mythology at any point it is obvious he has a command of Mythology. Not just Greek and Roman either, but those are his favorite.
It was natural for us to have him select a favorite myth and bring it to life in some way as a final project for his year long study of Mythology.
He chose to display the story of Theseus and the Minotaur. Daddy and Lightning Bug made the maze together. The Minotaur is a model figure. Lightning Bug wrote the story in his own words to accompany the display. Done.
What different assessment idea do you use in your home school?