I – Introversion preferred to extraversion: ISTJs tend to be quiet and reserved. They generally prefer interacting with a few close friends rather than a wide circle of acquaintances, and they expend energy in social situations (whereas extroverts gain energy).
S – Sensing preferred to intuition: ISTJs tend to be more concrete than abstract. They focus their attention on the details rather than the big picture, and on immediate realities rather than future possibilities.
T – Thinking preferred to feeling: ISTJs tend to value objective criteria above personal preference. When making decisions, they generally give more weight to logic than to social considerations.
J – Judgment preferred to perception: ISTJs tend to plan their activities and make decisions early. They derive a sense of control through predictability.
ISTJs are faithful, logical, organized, sensible, and earnest traditionalists who enjoy keeping their lives and environments well-regulated. Typically reserved and serious individuals, they earn success through their thoroughness and extraordinary dependability. They are capable of shutting out distractions in order to take a practical, logical approach to their endeavors, and are able to make the tough decisions that other types avoid. Realistic and responsible, ISTJs are often seen as worker bees striving steadily toward their goals. Despite their dependability and good intentions, however, ISTJs can experience difficulty in understanding and responding to the emotional needs of others. [dead link] Although they often focus on their internal world, ISTJs prefer dealing with the present and the factual. They are detail-oriented and weigh various options when making decisions, although they generally stick to the conventional. ISTJs are well-prepared for eventualities and have a good understanding of most situations. They believe in practical objectives, and they value traditions and loyalty.