The ability to attain and maintain a body position or balance is considered important in learning and performing motor skills. Static balance is defined as balance in which the body maintains equilibrium for one position; dynamic balance is described as maintaining equilibrium while the body is in motion or changing from one balanced position to another. A sample of 379 boys and 329 girls enrolled in the public schools of Nacogdoches, Texas, were selected as subjects for an investigation of static balance relative to sex and grade differences for primary grade children and the possible relationship of selected anthropometric measures to static balance performance. The assumption was made that students tested were representative of the various social, economic, and ethnic groups of children within the community since the entire population of the first three grades was tested. The measure of static balance used in this investigation was the Bass lengthwise stick test, which was constructed by means of factor analysis as a measure of static balance. The testing apparatus was a 12-inch by 12-inch board with a stick 1 inch wide and 12 inches long positioned in the center. After an extensive practice session, each subject was allowed three trials to attempt to remain balanced for one minute on the 1-inch rail with the preferred foot. The test was taken in tennis shoes and with the eyes open. In addition, the standing height, body weight, sitting height, and leg length of the subjects were recorded. The data were statistically analyzed by application of a 2 X 3 factorial design. It was concluded that static balance performance is relatively independent of body weight and height measurements. (MM)