Here are the type descriptions from page four of this link http://romania.testcentral.ro/media/...f-PCJ0C07P.pdf:

Introverted Sensing
Awareness of bodily sensations, both physical and emotional; generating
internal images, often of timeless perspectives; forms experienced as if
completely in the present moment; good with routine, non-distractable,
persevering; good memory and recall; adhering to own inner sense of reality
which may be at odds with others; strong aestetic appreciation often for
abstract forms of art; ability to read the form of the moment - the so called 'gut'
reaction.

Extraverted Sensing
Realistic; making few factual errors, good assimilation of details; experiencing
each moment fully, enjoying the 'good things of life' (such as food, art, music,
sports, the beauty of nature); easygoing, tolerant, patient; often good with
mechanical equipment, carpentry, decorating, graphic art, fashion, cooking and
other work demanding attention to detail; living in the moment connected to
specific details of the external world.

Introverted Intuiting
Guided by own inner images, seldom limited for long to a single perspective;
inner fantasy life, stories or story lines; can experience prophetic insights but
may have difficulty communicating personal insights to others; good insight
into complex situations; uses metaphors to explore possibilities; creative, quick
insight into the potential of relationships with others and between things, based
on wholistic internal perceiving.

Extraverted Intuiting
Spontaneous, innovative, initiating, nonconforming, and versatile; identifies
the practical possibilities in a situation; quick, imaginative solutions to
problems, thriving on change, focus on entire situation, wholistic images and
patterns, perceived in the external world; a flexible visionary; patient with
complexity; adaptable and easy acquisition of new skills.

Introverted Thinking
Analyzing the world based on own inner convictions and abstract categories,
not easily swayed by others; enjoiying intellectual criticism, abstract ideas,
subjects and activities such as philosophy, math, word puzzles; decisive with
ideas; working from underlying principles; may be unconcerned with practical
applications of their work; pursuing conceptual connections between ideas;
often prefers to work independently and may be shy with people; often
generates innovative ideas with creative meanings.

Extraverted Thinking
Organizing and labeling facts into meaningful, logical units; supporting laws,
objectives, criteria, policies and rules; governed by reason and not emotion;
striving for perfection based on a law or universal ideal; judges behavior (own
and others) based on the 'ideal model'; treats others fairly but impersonally;
wanting to find meaning in life and the world; wanting to get things done with
the least cost in time and energy and plan ahead.

Introverted Feeling
Using own internal standards to judge people and things, not submitting to peer
pressure or current trends, loyal, devoted, knowing own likes and dislikes,
often idealistic, working for a cause or purpose; may not be overtly
affectionate, holding tenderness and passionate conviction in reserve; often
believe they understand others but experience themselves as misunderstood;
strong sense of personal values and ethics that may not be shared by others.

Extraverted Feeling
Warm, friendly, sensitive; values relationships; tactful, trying to meet other's
needs; adhering to societal values and related appropriate behavior; valuing
other's opinions; wanting social approval; full of zest and enthusiasm; able to
express feelings freely; strong awareness of socially acceptable likes and
dislikes; harmonious, emphatic interactions with others.

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These were some of the most interesting function descriptions that I have read. To a large extent, I identify with Ti, Fi, Ni and Ne in this theory. It therefore makes me wonder
if the socionics definition of Ti is wrong, and it makes me wonder if the functions can appear in any order - as the inventory states.

OTOH, it seems that some functions are missing that socionics has down pat - socionics Se and Fe, for instance.

In any event, it is interesting food for thought: could the functions occur in any order? Do you identify with different functions in the above descriptions?

I find that theory's definition of Ti to be spot on in my case... But clearly the theory is not absolutely perfect either, as that is not what I am trying to say...