The 1977 edition of the Florida Functional Literacy Test is a 117-item multiple-choice measure of 13 mathematics and 11 communication skills required for minimal acceptable performance for students to graduate from state high schools. A student must pass at least half of the skills in mathematics and communications and get 70 percent of the items for each skill correct. To investigate the test's construct validity, the literacy test performances between groups of adults at three education and income levels were compared with performace on an independent multiple-choice cloze test of communications skills in reading. The groups also completed demographic descriptions. A substantial correlation between the communications total score on the literacy test and the independent measure of reading ability indicated strong support for the test's validity. The proportion passing the mathematics standard and communications standard increased markedly from the low- to high-level functional groups. Mean scores behaved similarly, indicating strong statistical support for validity. (CM)