Presents a readability formula and compares it with existing formulas and procedures. The formula uses reader feedback (identifying unclear words, sentences, paragraphs, figures, tables, and equations of reading material) and is considered appropriate for science and mathematics curriculum materials. (JN)

Provides step-by-step procedures for developing an index which uses the Gunning Fog technique to evaluate the level of reading difficulty of textbooks. Cites examples, illustrations, and several warnings in the discussion. (RT)