A book is the work of a mind, doing its work in the way that a mind deems best. That's dangerous. Is the work of some mere individual mind likely to serve the aims of collectively accepted compromises, which are known in the schools as 'standards'? Any mind that would audaciously put itself forth to work all alone is surely a bad example for the students, and probably, if not downright antisocial, at least a little off-center, self-indulgent, elitist. ... It's just good pedagogy, therefore, to stay away from such stuff, and use instead, if film-strips and rap-sessions must be supplemented, 'texts,' selected, or prepared, or adapted, by real professionals. Those texts are called 'reading material.' They are the academic equivalent of the 'listening material' that fills waiting-rooms, and the 'eating material' that you can buy in thousands of convenient eating resource centers along the roads. -- The Underground Grammarian