The fourth dimension of habit as described by Pinkham:

Triad of a Habit The deleterious effects produced by a habit depends upon the three factors – Duration, Frequency & Intensity.  a. Duration: The amount of time spent indulging in the habit.   b. Frequency: The number of times the habit is activated in a day.  c. Intensity: The vigor with which the habit is performed. Key Concept: Pinkham has added a fourth dimension to oral habits, ie., Direction.