ISTJs are careful and cautious, creating steadiness and stability in their lives. Having a sense of tradition, a sense of history in a place is important to them. INTX types are at the top of this list because what they tend to focus on is usually what constitutes intelligence and what is measured by traditional IQ tests: abstract conceptual logic and problem solving. known for their deep thinking and penchant for tackling complex issues independently, known as “the caregiver,”.