This is a theory developed by Wilhelm Fliess in the late 19th century, and popularized in the United States in late 1970s.

These cycles begin at birth and oscillate in a steady (sine wave) fashion throughout life, and by modeling them mathematically, it is suggested that a person's level of ability in each of these domains can be predicted from day to day.

Basic Parameters Description
  1. Physical

    Coordination, strength, well-being

  2. Emotional

    Creativity, sensitivity, mood, perception, awareness

  3. Intellectual

    Alertness, analytical functioning, logical analysis, memory or recall, communication

Other Parameters
  1. Spiritual

  2. Awareness

  3. Aesthetic

  4. Intuition