One of the reasons to develop intermediate catechisms like New City Catechism is to fill a gap between children’s catechisms and the longer and more extensive older ones. New City Catechism is short—52 questions and answers, one for every week of the year. It is based on Calvin’s Geneva, and the Westminster Catechisms, and perhaps most of all on the Heidelberg. As such it gives people a strong dose of each, introducing them to the practice of catechesis, and developing in them an appetite and capacity for going deeper. It can therefore be used by church leaders as a bridge toward teaching members the older and more extensive catechisms of their respective denominations.
Read Dr. Keller's post "Why Write New Catechisms" as well as his previous post "Why Catechesis Now?" I'd also love to hear from those who have started using New City Catechism. What do you think about it?