The aim of this study was to examine the effectiveness of the application of shaping technique with positive reinforcement, prompting, and fading technique in increasing the duration of on task-behavior in children with attention problem. The participant was AR, a 6- year-1-month-old boy who showed some behavior criteria or description of attentional disorder in interactive disorder category (ICDL-DMIC, 2005). The design in this study was a single-subject design with A-B type. The observer used a continuous recording method to measure the duration of on-task and off-task behavior when the child was working on some grade-1-level academic tasks. The result showed longer on-task behavior duration at the end of the intervention program.