After reviewing criticisms of the exclusive use of readability formulas to evaluate text difficulty and describing successful efforts to broaden the traditional readability formula approach, this report presents a 20 item checklist for determining text comprehensibility based on four criteria: (1) specific objectives or outcomes expected from the reading material, (2) text organization, (3) language difficulty, and (4) text design, including layout, color, type of print, and use of headings and graphic illustrations. The report then explains how to use the checklist to determine a text's difficulty and concludes that the checklist helps to overcome the conceptual limitations of readability formulas. (MM)