Text. As with all good technical writing, the fewer the words, the better. Strive for open white space. Limit the text to six or seven lines per slide and six or seven words per line (think “6 X 6”). Two or more short and simple slides of text are better than one slide with many words. Use no more than 40 characters per line (a character is any letter, punctuation mark, and/or space). Use headings for each slide.