Concordance is used to align scores from two different tests that measure similar constructs; however, it does not result in score interchangeability and does not optimize prediction accuracy. Rather, concordance can be used to set comparable cut scores on two tests or to compare the performance of candidates who took different tests.
The ACT Aspire Summative Assessments measure student progress in English, Math, Reading, Science, ELA (overall performance in English, Reading, and Writing), and STEM (overall performance in Math and Science). The tests are grade-level specific for grades 3 through early high school (grade 9 and 10). Other than writing, the tests are
vertically-scaled and scale scores are reported on a scale from 400 to a maximum score that varies across subjects and grades. ACT Aspire Summative Assessments include multiple-choice, technology-enhanced, and constructed-response item types, as well as a writing task (if the writing test is taken).
The ACT test measures student achievement in English, Math, Reading, Science, and Writing. The tests are oriented towards the general content areas of college and high school instructional programs. The tests are intended for students in grade 11 and 12, though students in earlier grades also take the ACT for placement and talent identification purposes. Scale scores are reported on a 1–36 scale for all subjects except writing. The ACT test uses multiple-choice items and a writing task (if the writing test is taken).
The PreACT test is designed to be similar to the ACT test but is targeted to the general population of 10th-grade students. The PreACT test does not include a writing test. Scores are reported on a 1–35 scale that is approximately on the same ACT score scale.
The philosophical basis of the ACT Aspire, PreACT, and ACT tests are similar, and the design of all three tests is informed by the ACT National Curriculum Survey. All three tests report Composite (average of the English, Math, Reading, and Science scores) and STEM scores (average of the Math and Science scores). ACT Aspire and the ACT test also report ELA scores (average of the English, Reading, and Writing scores). The tests also share reporting categories, which are used to group the items and tasks from the different domains represented on each test.