A Spatial Orientation measure with 20 parallel forms was evaluated under various conditions with three samples, totalling 265 Ss. The forms were based on the Thurstone Card Test, but the format and time limits were modified. The new measure correlated at low positive levels with Speed of Closure (.35), Visualization (.28), Number Facility (.27), and Wechsler-Bellevue Vocabulary scores (.43), but factor analyses established that it and the Thurstone Card Test were independent of the other nine measures in the present Repetitive Psychometric Measures battery. Although the internal consistency of single forms was low before practice, it increased with practice (e.g., .63 to .77).
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