Logical Types

Logical types (ILE, LII, SLE, LSI, LIE, ILI, LSE, and SLI) have logical information elements (Te/Ti) in their strong functions and ethical information elements (Fe/Fi) in their weak functions.

They excel at perceiving structures, cause-and-effect relationships, consistency, systemic organization, and underlying principles. Their speech typically features precise phrasing and clear model-building: “If X, then Y,” “This contradicts that,” or “This follows from that.” Every link is transparent. Ask them the difference between a regularity (pattern) and a rule, and they will outline the boundary with clear examples.

In contrast, their discernment of emotions, relationships, and subtle human states tends to be coarser. They may understand these areas formally but miss finer nuances, often defaulting to broad statements such as “He’s a good person” or “We have a normal relationship” and stopping there.

Key to Diagnosis: Focus on resolution, not topic
The strength of a function is revealed by the fineness of discernment within a topic, not by the topic itself. A logical type discussing feelings will usually generalize quickly, treat similar concepts as synonyms (e.g., “love” and “affection”), and rapidly exhaust emotional nuances.

Learning to listen this way adds a crucial layer of perception: you stop focusing only on content and start noticing where speech unfolds in rich detail versus where it collapses into broad blocks or stalls.

Source: S. Ionkin

Logical Types Subgroups

Clubs

Communication Style

Argumentation Method

Implementation Groups