The courses offered by the CAD Correspondence Institute have been designed not only to teach you how to use AutoCAD and/or Inventor, but also how to master them.  The courses are NOT tutorial style where you just follow instructions, repeating examples from the manual or instructor. After reading and understanding the material in each lesson, you must complete the lab exercises on your own. You must prove that you know the material and complete the Lab Exercises in the time allowed with 100% accuracy before going on to the next lesson. This is called competency-based learning. You learn to master AutoCAD and/or Inventor in a very carefully designed step by step order.  When you have completed all of your desired courses, you will understand and be able to apply any command/feature/process in AutoCAD and/or Inventor to create, dimension and print any model, assembly or drawing you want.