OPERATIONAL SEQUENCE DIAGRAM FOR AWAKENING IN THE MORNING

Barry H. Kantowitz and Robert D. Sorkin, Human Factors: Understanding People-System Relationships, John Wiley & Sons, 1983

They are placed so that the ideal operator should be 1372 mm (4 1/4 ft) tall, 640 mm (2 ft) across the shoulder, and have a 2348 mm (8 ft) arm span.