A cumulative graph does not go down...it only remains at the same level or increases. You can look at a cumulative graph and in one glance you can see exactly how many items are mastered, exactly how long it took for them to achieve mastery on the items and you can also see the average number of sessions it takes to acquire a new skill. This is a valuable type of data collection for a BCBA who is doing program analysis and guiding a kiddo's program. Furthermore, if we enter phase change lines on a cumulative graph after a program modification is made, we can see the impact our program mod had in just one glance at the graph. If the acquisition rate suddenly increases after the phase change line and they acquire skills faster, we know it was effective. If it remains stagnant then we know this mod wasn't the best choice for that particular kiddo. Please let me know if we can add this type of graphing feature to HiRasmus.