An early demonstration of single-subject research in an applied setting was conducted by Vance Hall and his colleagues in 1968. To address disruptive behavior in a classroom, researchers first observed the students to establish a baseline of their usual activity. Following this, a treatment was implemented where the teacher exclusively provided positive attention when a student engaged in schoolwork, ignoring any disruptions. The intervention led to a significant increase in study time and a drop in misbehavior. When the positive reinforcement was paused, the students reverted to their prior disruptive habits, confirming that the teacher's focused attention was the direct cause of the behavioral improvement.