This diagram shows a graph with ‘stress level’ on the x-axis, and ‘productivity’ on the y-axis, and depicts a bell curve shape. There are various segments and labels. The low end (i.e. low stress level, low productivity) segment is ‘too little stress (underload)’. At the bottom of the curve is the label ‘inactive’. Slightly higher up the curve is the label ‘Laid back’. The next segment, which reaches the middle of the bell curve as it crests (i.e. moderate stress, high productivity), is ‘Optimum stress’, with the label ‘Peak performance’ just before the peak. The next segment then begins the descent back down the bell curve (i.e. stress increasing, productivity decreasing). This segment is ‘Too much stress (overload)’, with the label ‘Fatigue/tension. Poor sleep, irritability, worry’ on this side of the peak. The high end (i.e. high stress, low productivity) segment is ‘Burnout’. Halfway down the curve is the label ‘Exhaustion. Anxiety, panic, anger, depression, sleeplessness’. At the bottom of the curve is ‘Breakdown. Lasting disease/infections, heart attack, cancer, diabetes, etc.’