The DMG 3rd edition is the fourth evolution (2016) of our original publication called the Comprehensive Resource Tool published in 2006. We have continually updated the original version to ensure that we have included as up to date referenced material as possible. Our newly updated and expanded product contains two new sections covering academics and technology (including updated keyboarding and current technology skills). We have added more detailed fine motor, social/emotional, play, language and cognitive milestones to broaden the scope of the DMG. Updating references resulted in changes in some of the age equivalents, and we have continued to modify some of the language to make the DMG more user friendly. However, the Sensory Motor section continues to address a performance area that may be more familiar to occupational therapists. If some of the terminology is unfamiliar to you, please consult your local occupational therapist for assistance.