This document summarizes the Knox Basketball Test constructed in 1947 to measure basketball playing ability. The test consisted of 4 parts that tested speed dribbling, passing, layups, and reaction time. It was administered to 10 skilled high school basketball players, with their scores compared to non-players and less skilled players. The tests were timed and involved dribbling around obstacles, passing against a wall rapidly, making a layup after dribbling, and placing a coin in a cup based on a direction called out. Scores were recorded in seconds to complete each part and the full test.