Although much of the core content remains largely unchanged in the 4th Edition, considerable attention was paid to adding fresh and engaging features and language learning devices. Additionally, based on user feedback, some of the lessons in Volumes 3 and 4 were condensed and the number of new words reduced to facilitate classroom instruction. We recommend that you carefully check any materials you created for the 3rd Edition to make sure you do not omit any updated content or include outdated content that has been removed from the new edition.
The video components introduced to the series for the 3rd Edition can be used alongside the 4th Edition.