With the promulgation of the motu proprio Mitis iudex Dominus Iesus for the Latin Church and the motu proprio Mitis et misericors Iesus for the Eastern Catholic Churches, both dated August 15, 2015, Pope Francis addressed the calls during the Third Extraordinary General Assembly of the Synod of Bishops (October 5–19, 2014) for a simplified procedure for the declaration of the nullity of marriages. Pope Francis introduced a briefer process to be conducted by the diocesan bishop and he simplified the current ordinary nullity process. The new procedural norms went into effect on December 8, 2015. New legislation always challenges first and foremost the practitioner: how is the new legislation to be understood and applied? Immediately after the new law was made public, a number of articles on this new legislation were published in The Jurist. The School of Canon Law of The Catholic University of America organized a March 2016 Workshop on the very topic of this important procedural reform. These articles are now brought together in one volume to assist those who work with these norms in the various tribunals dealing with marriage cases. It is hoped that this volume will be of great service to all those who serve the people of God in the ministry of justice, and that these contributions will truly be a help in understanding and applying the new norms.