This is a wonderful program. We bought the four volumes and binder separately, but we loved the first couple so much we ended up getting the whole series within the month. My childcare kids (ages 5 months to 8 years) love the songs, signs, color sheets, etc. They also love that they can earn a certificate for each lesson. We have children as young as 9 months repeating the simple signs and my children 2 and up know all the signs we have gone through. The only problem we had is the three hole punch through the pages doesn't match up to the binder so I re-punched all the pages.