This is a very popular religion series for Catholic homeschoolers. There are probably many reasons for this: they're reasonably priced, they're filled with beautiful selections of fine religious art, and they're unquestionably orthodox. The series incorporates questions from The Baltimore Catechism for memorization. Some homeschoolers don't like the brief content (the text contains approximately one lesson per week - although there is also a work book, teacher's manual and extensive resource guide available for each grade).