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http://jamesbkim.com/content/definit...tive-functions
Carl Jung described 8 cognitive functions in which people use. The following table is their definitions. [source]
Function Description
Se - extraverted sensing Experiencing the immediate context; noticing changes and opportunied for action; being drawn to act on the physical world; accumulating experiences; scanning for visible reactions and relevant data; recognizing "what is"
Si - introverted sensing Reviewing past experiences; "what is" evoking "what was"; seeking detailed information and links to what is known; recalling stored impressions; accumulating data; recognizing the way things have always been

Ne - extraverted intuiting
Interpreting situations and relationships; picking up meanings and interconnections; being drawn to change "what is " for "what could possibly be"; noticing what is not said and threads of meaning emerging across multiple contexts
Ni - introverted intuiting Foreseeing implications and likely effects without external data; realizing "what will be"; conceptualizing new ways of seeing things; envisioning transformations; getting an image of profound meaning or far-reaching symbols
Te - extraverted thinking Ordering; organizing for efficiency; systematzing; aplying logic; structuring; checking for consequences; monitoring for standards or specifications being met; setting boundaries, guidelines, and parameters, deciding if something isworking or not

Ti - introverted thinking
Analyzing; categorizing; evaluating according to principles and whether something fits the framework or model; figuring out the principles on which something works; checking for inconsistencies; clarying definitions to get more precision
Fe - extraverted feeling Connecting; considering others and the group - organizing to meet their needs and honor their values; adjusting and accommodating others; deciding if something is appropriate or acceptable to others
Fi -introverted feeling Valuing; considering importance and worth; reviewing for incongruity; evaluating something based on the truths on which it is based; clarifying values to achieve accord; deciding if something is of significance and worth standing up for.