Although behavior analysis relies primarily on visual inspection for interpreting data, previous research shows that the method of display can influence the judgments. In the current study, 26 Board-Certified Behavior Analysts reviewed two data sets displayed on each of three methods--equal-interval graphs, tables, and Standard Celeration Charts--and determined which data set showed more change per unit of time and which showed less variability. Regardless of their preference for one method of display, participants handled data displayed on the Standard Celeration Chart most efficiently. However, the accuracy of their judgments across all types of data display was low and may indicate the need for additional training, even for persons holding the Board-Certified Behavior Analyst credential. (Contains 5 tables, 6 figures and 1 footnote.)