Preparing directions at the level found in books is a challenge. However, it is possible to make acceptable diagrams using a variety of methods. Computer based systems can be used and this can serve as an opportunity to encourage students to refine and polish their work.
Many people use specialized tools to produce drawings, but even the basic draw tools work well.
Other options are to scan in hand drawn diagrams, scan actual models in development, or use a digital camera to produce images. These so-called acquired images can also be marked up using a computer drawing program. Several different techniques for producing diagrams are included in this paper. Digital Camera Digital cameras do not use film, but produce data that is uploaded into programs. One brand name is QuickTake manufactured by Apple.