At the core of Myers Briggs & Jung's theories is the idea that we all have four mental muscles (Sensing, iNtuition, Thinking and Feeling) and we use them in one of two directions.  The first direction is towards the outer world of people, things and situations, ie: Extraversion.  The second direction is towards the inner world of ideas, information and beliefs, ie: Introversion.

This is represented by the team role mandala, which is divided into four segments, each of a different colour.

Sensing

The segment at the top represents Sensing:

When you are operating on this part of the mandala, you are dealing with what you know, looking for facts, relying on experience, taking a practical appreoach, tending to be realistic, using what's there and having confidence in trusted solutions.  The essence of Sensing is to ask "What is real?".

Intuition

The segment at the bottom represents iNtuition (this isn't a typo - we capitalise the N because capital I is reserved to denote Introversion).

When you are operating on this part of the mandala, you are dealing with the unknown, looking for possibilities, relying on your insight, exploring new perspectives, tending towards idealism, changing and improving what is there, inventing your own solutions.  The essence of iNtuition is to ask "What might be?"

Thinking

The segment on the left represents Thinking:

When you are operating on this part of the mandala, you are dealing with concepts, truth and correctness.  You use logical analysis, build structure, observe objectively, seek to understand and apply universal principles and make logical connections between ideas and concepts.  The essence of Thinking is to ask "Is it true or valid?"

Feeling

The segment on the right represents Feeling:

When you are operating on this part of the mandala, you are dealing with values, relationships and feelings.  You appreciate the importance of things, build harmony, participate by investing oneself, seek to promote and uphold personal values/ethics and evaluate the inherent worth of things or ideas.  The essence of Feeling is to ask "Is it important?"

Extraversion

In addition to the four segments, the mandala is also divided into an inner and outer ring, cutting through each of the four segments.  The outer ring represents extraversion:

When you are operating on this part of the mandala, you are dealing with the outer world of people and things.  When you are extraverting, you are expressing views, tending to seek social contact, interacting with the environment, tending to act first, think later, developing ideas 'out loud' and also tending to dip into a wide variety of subjects.  The essence of extraversion is to 'do things' in the outer world.

Introversion

The inner ring represents introversion:

When you are operating on this part of the mandala, you are dealing with the inner world of ideas and information.  When you are introverting you keep your own opinions, tend to seek privacy, concentrate on thoughts, tend to think first, act later, express conclusions and focus on a few subjects, but in some depth.  The essence of introversion is to 'thinks things through' in the inner world.

Eight Function-attitudes

Combining these four mental muscles with the two worlds produces eight things.  These eight things can be described as function-attitudes, or psychological types, or team roles, or cognitive processes, depending on the context in which they are being described.  The mandala above left shows the team role names, but the below version of the mandala shows the eight psychological types using widely used mnemonics.  For example, Se = Sensing used in the outer world (ie:extraverted);  Fi = Feeling used in the inner world (ie: introverted).