ISTP (Introverted, Sensation, Thinking, Perception)
or
your dominant function is Thinking and very introverted
your auxiliary (second most important) is Sensation and very introverted
your tertiary (third) is iNtuition and very introverted
your inferior (fourth) is Feeling and very introverted
What does this mean?
The most important mental muscle (or 'dominant function') for an ISTP is the judging one of Thinking. This means you like making decisions on the basis of logic, using objective considerations, and are concerned with truth, principles and justice. You are analytical and critical, tending to see the flaws in situations and you usually (though not always) take an objective approach when dealing with people or problems.
The judging Thinking function is introverted. That is, Thinking is used primarily to govern the inner world of thoughts and emotions. As an ISTP you will therefore spend time thinking analytically, organising thoughts on a logical basis and developing an understanding of the principles involved in a situation. You may spontaneously tend to feel critical of a person or situation, but not necessarily express that criticism. Also, although you are inwardly decisive, you may not communicate your decisions to others (so they don't always realise when you've made your mind up). You tend to think mostly about impersonal issues, focusing more on practical concepts, truth and how things work rather than dwelling on people's feelings and emotions.
The MMDI reports your preferred leadership style as being a leadership theorist. When someone is being a leadership theorist, they using the best models or explanations of how the organisation works to improve its performance. A leadership theorist use the best leadership theories available to understand and improve the hidden dynamics that have the greatest impact on overall team and organisational performance.
Your second preference for leadership is as a a goal-oriented leader. Goal-oriented leadership involves setting clear and specific goals. These goals are often cascaded, so that senior management have high-level goals that are supported by the more detailed goals of staff in the rest of the organisation. These goals may also be laid out in a plan, as a sequence of events to achieve a long-term objective.
whatever all that is supposed to mean.