This textbook is written with the intention of helping the users get familiar with Pro/ENGINEER Wildfire, SolidWorks 2004, or Autodesk Inventor 8 in one day. With the variety of Computer Aided Design (CAD) packages available in the market, it is difficult for an individual to decide which software package to use. The "Learning in One Day" approach of learning a CAD package will help the readers in selecting a software program that is best suited for their work requirements. This textbook is not intended to make the readers expert in these programs, but it will definitely help them in understanding the basic concepts and functionality. This textbook features one real-world mechanical engineering project for each of the three CAD packages: Blower Subassembly created using Pro/ENGINEER Wildfire, Master Rod and Piston Subassembly created using SolidWorks 2004, and Plummer Block Assembly created using Autodesk Inventor 8. These projects guide the users step-by-step through the process of creating components, assembling them, and generating the drawing views. At the beginning of each section, the commands and important definitions are discussed in brief. This is followed by explanation of the three basic modules of each software package, namely, Part Modeling, Assembly Modeling, and Drawing Views. The author provides free technical support to all the users of this textbook. The users can contact the author at techsupport@cadcim.com to get free online technical support. The author also provides the following learning resources free to the users of this textbook. · Part files used in all three projects · Assembly files used in all three projects · Drawing files used in all three projects. The author also provides the PowerPoint Presentations of all three projects in this textbook free to the teaching faculty. The faculty members can contact the author at stickoo@calumet.purdue.edu or tickoo@cadcim.com to access the PowerPoint Presentations of this textbook. Target Audience 1. Students of one-day seminars or short review classes on Pro/ENGINEER Wildfire, SolidWorks 2004, and Autodesk Inventor 8. 2. Individuals who want to get an overview of these three CAD programs. 3. Managers who want to get familiar with the CAD program being used by their design team. 4. Faculty members who want to select a CAD program for their parametric solid modeling courses. 5. Engineers who want to select one of these three programs as a design tool for engineering design. 6. Readers preparing for their regular classes in parametric solid modeling. 7. Readers who want to upgrade from earlier releases of Pro/ENGINEER, SolidWorks, and Autodesk Inventor. 8. Aspiring engineers preparing for a job interview or want a quick hands-on session on parametric solid modeling.