This document provides a preface and disclaimer for a set of 2D and 3D CAD exercises. The preface outlines that the book contains 100 2D exercises and 50 3D exercises in CAD software like AutoCAD, SolidWorks, and Inventor. It notes each exercise can be done separately at any skill level and uses metric dimensions. The disclaimer states the exercises are for practice and not tutorials, and that no part of the publication may be reproduced without permission.