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Computer Aided Design has entered a mature stage and many areas of everyday life. Thus, CAD courses are part of many educational programs. In regard to the increasing importance of CAD education, a recent special issue of the journal Computer Aided Design was dedicated to this topic. Though the articles presented are certainly highly interesting, they contain little information on how to teach CAD in practice. The tutorial at hand tries to fill this gap.CAD has been part of various geometry curricula at Austrian secondary schools since 1989. Working with CAD belongs to the basic skills an average Austrian pupil should be taught starting at the age of 13. Based on 15 years of experience in teaching CAD at all levels -from secondary school to graduate courses at University -this tutorial will outline the fundamental geometric and general concepts, curricula for different stages of CAD knowledge, new teaching methods and didactical principles, and the new role of the teacher. By showing typical examples of teaching sequences and results of student projects, this presentation will focus on the most important rules for `How to teach CAD'.

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Using real examples of applied mathematics in upper secondary school one has do deal with inaccurate measures. This will lead to over constrained systems of linear equations. This paper shows an instructive approach which uses methods of descriptive and computer aided geometry to get a deeper insight into the area of calculus of observations. Using a qualified interpretation one can solve problems of calculus of observations with elementary construction techniques of descriptive geometry, independent of the norm one uses.