The image below represents the results from Hall et al. (1968) where the percentage of student's focused studying was measured over several days. Once a baseline percentage was established, the teacher would give positive attention during study time at which time the percentage of study time was again measured. The teacher stopped the positive attention then resumed it later after another baseline had been reached. 2. What type of design does this represent? Percentage of Time Studying Baseline 100 BO 60 40 20 Positive attention Baseline Positive attention 10 15 20 25 30 Sessions