The other kind of mental process identified by Jung is judgment, a process of organising and evaluating information, and coming to conclusions. Using the judging process, some sort of evaluation is made and Jung identified two kinds of judgment: Thinking and Feeling. The T-F dichotomy is our ‘output’ scale - ie how we each make decisions.
Both of these can be used in either the outer, extraverted world or in the inner, introverted world. Thinking judgments are based on objective criteria or principles, as Jung describes:
...judgement is reserved as to what significance should be attached to the facts in question. And on this significance will depend the way in which the individual deals with the facts.
Feeling judgments are based on personal, interpersonal, or emotional values as Jung describes:
...adaptation will depend entirely on the feeling value he attributes to them.
Thinking types tend to make their decisions based on data, evidence and rational thought. They tend to be pragmatic and not swayed by antipathies or emotions but prefer empirical data.
Feeling types tend to make their decisions based on values, emotions and impact on people. This is a slightly more illogical way of making decisions (when compared to logical ‘T’s) however ‘F’s can often ‘feel’ situations and so their decisions often take account of the less obvious more subtle issues that transcend the logical. This is not to downplay the importance of this function of decision-making or question its validity but it does make it more difficult to quantify. As Jung himself (a ‘T’) confessed:
…I freely admit that this problem of feeling has been one that has caused me much brain racking.