This textbook explains how to create freeform surface and modify them to create freeform face of a solid body using Siemens NX 8.0/8.5. NX is a three dimensional CAD/CAM/CAE software developed by Siemens PLM Software Inc., Germany. This textbook is based on NX 8.0 and updated to NX 8.5 by adding a new section in each chapter for modification. Users of earlier releases can use this book with minor modifications. We provide files for exercises via our website. All files are in NX 6.0 so readers can open the files using NX 6.0 and later releases. It is assumed that readers of this textbook...