Layered Reasoning and the Consensus Verification Framework: A Reflective Engineering Case Study of AI-Assisted Decision Verification

Engineering decisions increasingly rely on collaboration between human experts and multiple AI systems. While existing approaches often evaluate individual model performance, comparatively little attention has been given to how independent reasoning processes can be combined to improve confidence in engineering decisions. This working paper presents a reflective engineering case study derived from real-world AI-assisted engineering practice. Rather than describing a controlled experimental study, it documents how repeated independent reviews, iterative verification, and structured disagreement gradually evolved into a practical verification methodology during the development of engineering software and system architecture. The paper introduces two complementary concepts. Layered Reasoning describes a structured process in which engineering problems are examined through multiple conceptual layers—including objectives, assumptions, evidence, system relationships, constraints, and consistency—before conclusions are formed. Building upon this approach, the Consensus Verification Framework (CVF) proposes that engineering confidence should emerge not from agreement alone, but from independently justified reasoning, explicit examination of disagreement, traceable evidence, and iterative verification until the remaining uncertainty is understood or documented. The objective of this work is not to claim universal validity, but to present an exploratory methodology derived from reflective engineering practice that can be evaluated, challenged, and refined by the wider engineering community. If validated through broader application, the proposed framework may contribute toward more transparent, explainable, and trustworthy AI-assisted engineering decision-making.