This study investigated the effects of ball color and preferred ball color on children's catching process. Two experiments were conducted involving 147 children ages 6 to 10 yr. The study design clearly specified procedures for underhand projection of balls, trajectory of ball flight, height of interception for the child's catch, distance of catch, and scoring of process characteristics of each catching attempt. Analysis of variance indicated no significant differences between mean scores for preferred and control colors of balls. When effects of specific ball color were analyzed, the blue balls which possessed the highest ball color/background color contrast ratio, had the highest mean values. No clear pattern of effects, however, was found in order of descending illuminance contrast ratio. Results are discussed in relation to the developmental task analysis proposed by Herkowitz and by Morris.