Within the framework of Carl  G. Jung / Myers-Briggs personality type theory  functions refer to the mental processes used to take-in and process information.  There are four functions.  Sensing  and intuition , which represent and individual’s preference for taking in data from the environment.  An individual uses both of these functions but has a natural tendency to favor one over the other.  The sensor prefers using his / her sensing function.  Those with a sensing preference make concrete and realistic observation of objects or circumstances in the immediate environment. Where as an individual with a natural tendency for the intuitive preference makes mental connections with observations of his / her surroundings and may perceive something entirely different from the sensing type person. Sensors tend to make very detailed observations of their environment and initiatives are very general in their observations.  The thinking and feeling function address how and individual processes data and makes decisions. As with the sensing and intuitive functions an individual uses both the thinking and feeling function but is naturally drawn to use one of the functions over the other.   A person with a thinking preference uses objectivity as criteria when making decisions.  This type is considered to be very logical and methodical in the decision making process.  A person with a feeling preference for decision-making uses a subjective approach.  Individuals with a preference for the feeling function believe that personal considerations are important and should not be left out of decision-making.  Individuals with a preference for feeling are also very value oriented in their decision making process, their personal values are at the center of how they arrive at decisions and can not be in conflict with the decision that is made.         Dominate Function: An individual’s most highly refined function, it is the function an individual prefers using the most often.      Auxiliary Function:  An individuals’ second most preferred function.  The auxiliary function works with and supports the dominant function.     Tertiary Function:  An individual’s third preferred function.  It is a lesser-developed function, which works to support the auxiliary function.    Inferior Function:   An individuals’ least developed function. The inferior function is the opposite function of the dominant function, for example and individual who is a dominant thinker would have feeling  as an inferior function and an individual who is a dominant feeler  would have thinking  as an inferior function.