overview of the unique characteristics of United States (U.S.) forests and sustainable. forestry practices, the reinforcing system of federal and state forest management laws, and the U.S. certification programs that further support sustainable forestry.
Meeting with the Mentor: The hero encounters someone who can give him advice and ready him for the journey ahead. Crossing the First Threshold: The hero leaves his ordinary world for the first time and crosses the threshold into adventure. Tests, Allies, Enemies: The hero learns the rules of his new world. During this time, he endures tests of strength of will, meets friends, and comes face to face with foes.
Threshold is defined as the he change in a stimulus that is detectably different 50% of the time. If the change is from no stimulation at all, that threshold stimulus is called the absolute threshold. Otherwise the threshold is a difference threshold, because it measures the threshold for detecting the difference between stimuli: a stimulus before and after it is changed. The size of the stimulus change required for detection is called the threshold.