| Sumario: | 367 adults were given short passages to study for limited periods of time. They then had to answer open-ended questions on the content. A separate-groups design with groups of about 50 adults and a Greco-Latin-square design using 96 adults appeared to have about equal potential power statistically, but the differences between comparable conditions were almost twice as large with separate groups. Text typed in pica combined upper- and lower-case letters was comprehended on the average about 13% more rapidly (p < .02) than text in pica or Siemens all upper-case letters. There was little difference (p> .05) between the Siemens all upper case, a dyeline copy of the Siemens, and pica or elite all upper case; and little difference also (p> .05) between pica and elite all lower case, which gave intermediate rates of comprehension. The lettering of the question sheets did not affect the results.
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