They are content to know what their partners expect of them so they can meet their expectations accordingly.
Compatibility for ISTJ personalities matches that of the ESTP (extraverted, sensing, thinking, and perceiving) and ESFP (extraverted, sensing, feeling, and perceiving) personality types.
The ISTJ personality is introverted, sensing, thinking, and judging.
Generally, those with the ISTJ personality are quiet and reserved.
They cherish security, peaceful living and are well-organized, often to the point of being meticulous.
Once they become close to someone and develop an understanding of that person’s needs and feelings, the ISTJ personality will make every effort to support those needs.
Increased stress can place the ISTJ personality into "catastrophe" mode.
ISTJs are introverted and some partners find this to be challenging.