Multiple Ages: How to plan a group subject with one text

One of the many benefits of eclectic homeschooling is the ability to choose one text for a subject and teach your children as a group at mixed ages. We do this with Bible, worldview, science and history. We’ve also done this with a few other things along the way, such as GrammarLand. And by the way, we love it! It did seem a little daunting at first, though. I poured through catalogs looking for something made for this purpose, and there’s not much out there. I wondered, “How do you do this?” We’ve been doing group subjects for four years