Lemkau discusses three 'axes' for future progress in mental hygiene. The first is the axis of development of the personality, with stress on the point that anticipation of what is likely to happen protects one against useless and damaging anxiety. Preparation for unpleasant situations makes those situations far more tolerable, far less stressful. The second axis is the epidemiology of mental health and mental illness. This allows one to plan for medical care and can clarify the problems of etiology. The third axis for progress is the study of human interrelationships, those forces which enable one to function well or force one to function badly.