Book excerpt: This book presents an overview of the materials, court cases and mutual agreement procedures implemented in Canada, USA and Mexcio. In addition, it provides a background to the development of tax treaty law and the information necessary to interpret a tax treaty based upon the principles codified in the Vienna Convention of the Law of Treaties. Contents: the background of the early model tax conventions; the development of tax treaty law; the specific materials from Canada, the United States and Mexico; proposal for a trilateral tax treaty for North America to provide full relief from the harmful barriers against free movement of capital and services.