I agree that this is designed with teens in mind, but also with adults who may be hesitant to pick up the thicker volume of the most recent Catechism. This is real life, with real life examples of partial truths being clarified by precise, yet down to earth answers and quotes. We love this book and recommend it for after Confirmation, along with Theology of the Body and for Post RCIA or for an ongoing adult education. Don't let the title "for Teens" mislead you. This is a catechism like no other and a small, quick to read, hard to put down little book. There's a helpful teacher's manual as well and NO, you don't have to add other sources to the program but it's always a good idea to have prayer and praise during one's class. Speaking of which, each section has a prayer and saint's life highlighted as well. This is a priceless little book and would make an excellent Confirmation gift, too!