3 Protectors (SJ) All SJs = 43.2% 
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ISTJ - Duty Fulfiller [Examiner, inspector] = 9.8%- Personality-
ISTJ Doing What Should Be Done--
Personality Link-Strong(Some) : Compulsive ( Schizoid ) 
Gender Traits : > men- Total:8.5% Male:10.5% Female:6.5% 
[Repressed] Function : Extroverted iNtuition- ISTJ
1. Dominant : Introverted Sensing (Si)
2. Auxiliary :Extroverted Thinking (Te)
3. Puerile : Introverted Feeling (Fi)
4. Repressed : Extroverted iNtuition (Ne)
Jungian sibling : ISFJ (shared Si dominance)
KeirseyTemperament : SJ (along with ESTJ, ISFJ, & ESFJ)
M-Jung-Keirsey-E's Model : ESFP or ESTP;ESFP;ESFP

ISTJ [(05)03M-05A-08F] %=T10 F07 M11 SJ43 {Compulsive (Schizoid)} 
[Chart the Course (IJ Melancholic)-Max Perfectionist {emotionally sensitive,perfectionistic introverts}]
(SJ) S-Steady=43.2% Protectors} (Examiner,inspector)=[Doing What Should Be Done] Planner Inspector + Stabilizer-Guardian 
SFJ - STJ I-Reliant Dependable-(ISTJ/ESTJ,Te/Si) 
ISTJ-ISFJ Loyal,Traditional,Dependable,Straightup,Commits 

Repress Extroverted iNtuition function.resist change - view ingenuity with skepticism Quiet.serious.earn success by thoroughness-dependability. Practical.matter-of-fact.realistic,responsible. Decide logically what should be done,work toward it steadily.regardless of distraction. Take pleasure making everything orderly-organized – in their work,home,life. Value traditions,loyalty. quiet.serious,conscientious. think before speaking.fairly cautious jumping new experiences. so private.rarely share feelings-reactions people they don’t know well. need a good deal of time alone,enjoy the company of small group close friends.rarely ones initiate get-togethers. selective about interests.preferring study things in depth,participate in physical or hands-on activities. careful with facts.money.their possessions,may have excellent memories for details. Practical.realistic.people describe them as matter-of-fact,polite,responsible. logical-organized Even tense situations able remain calm-cool. most comfortable predictable routines.like be prepared all times.don’t usually like surprises-changes. skeptical about untested ideas.may get bored too much theoretical discussion. strong opinions.sometimes act a bit controlling-inflexible. like compliments about accomplishments.may become angry others make unfair-arbitrary decisions. need to understand logical reason for decisions since once make up minds-may be reluctant to change 

 I. S. T. J. - Duty Fulfiller - Reliant 

Serious,quiet, interested in security and peaceful living. Extremely thorough, responsible, and dependable. 
Well-developed powers of concentration. 
Usually interested in supporting and promoting traditions and establishments. 
Well-organized and hard working, they work steadily towards identified goals. 
They can usually accomplish any task once they have set their mind to it. 
ISTJ is the most common type among practicing engineers. They are usually quiet and can appear withdraw because of the I, but most of them make good use of their quiet time by thinking of ideas and how facts go together. As S’s, they concentrate on executing the job at hand, using logic (a T trait) to figure out the solution. Their J preference enables them to schedule and plan ahead, and they don’t like to have to adapt and change once they start down a path. ISTJs are dependable, organized, goal-oriented, and focused on the facts. Occupational Trends Management Administration Law enforcement Accounting
Introverted Sensing Thinking Judging Description ISTJs are loyal, logical, and responsible. The primary function of the ISTJ is Introverted Sensing, which means they like things to be quantifiable. The auxiliary function is Extraverted Thinking, so they will willingly speak if only data is to be presented; otherwise, the ISTJ will remain silent. They work with facts and take a methodical approach towards solving problems. They will also put themselves at risk to carry out any task assigned to them. They generally know right from wrong in their areas of interest and responsibility which makes them devoted and dutiful individuals. ISTJs would rather see consistency in people, as seeing others keep up their ends of the bargain can be extremely frustrating. They generally keep to themselves until approached. Nevertheless, ISTJs will not try to appeal to someone else’s opinions, they would rather be truthful than tactful (Butt “ISTJ”). ISTJs may have a tendency to dismiss other people’s opinions without fully understanding them. They may also have selfish tendencies in which they ignore everyone else’s priorities. Structure is very important to them and this may come across as being rigid (“Portrait of an ISTJ”). Careers . Accountant . Engineer . Scientist . Editor . Manager . Law Enforcement . Banker . Marketer . Teacher . Business Analyst . Marketing Key Elements to Working with this Type . Do not expect an ISTJ to be tactful; always expect the truth. . Offer constructive criticism, they are always willing to improve upon something. . Show the same devotion as ISTJs do; they value their commitments. . Talk through a problem with the ISTJ. ISTJ - Reliant Quiet, serious, earn success by thoroughness and dependability. Practical, matter-of-fact, realistic, and responsible. Decide logically what should be done and work toward it steadily, regardless of distraction. Take pleasure in making everything orderly and organized – their work, their home, their life. Value traditions and loyalty.