Landes relocates conceptual engineering from the philosopher’s desk to the causal world in which labels either propagate or fail. His tripartite framework—label, psychological states and worldly referents—describes conceptual uptake as an interaction among linguistic form, cognition and environment. A well-constructed concept cannot succeed through normative elegance alone; its name, associations, social setting and target community must be investigated empirically. Psychology, experimental linguistics, sociology and history therefore become constitutive methods rather than supplementary checks. The paper’s strongest intervention concerns implementation: conceptual engineering is incomplete until designed devices travel, acquire users and alter practice. This challenges theories that evaluate concepts exclusively by internal coherence or stipulated function. The bridge to communication design and urban research is exact. A sign, category or planning term only becomes operative through situated interpretation, institutional repetition and material consequence. Propagation is not a final publicity stage but the field in which conceptual adequacy is tested.
