-- Incorporates all the final modifications made in the official Latin text of the Catechism
-- Provides a much more complete index
-- Contains a brand new glossary of terms
-- Includes Pope John Paul II's 1997 decree promulgating the official Latin text.
All this new information adds up to 100 pages more than in the original edition;
which means the second edition is not only easier to use and easier to understand,
it's the definitive version of the Catechism.