``Students usually demand to be taught the language that they are most likely to use in the world outside (FORTRAN or C). This is a mistake. A well taught student (viz. one who has been taught a clean language) can easily pick up the languages of the world, and he [or she] will be in a far better position to recognize their bad features as he [or she] encounters them.''-- C. H. Lindsey, History of Algol 68. ACM SIGPLAN Notices, 28(3):126, March 1993.
The following languages are used in teaching at Iowa State. (The reader can easily decide which of the following are clean languages.)