What Is the Constitutional Structure of Foundational Inquiry? The Internal Architecture of the Foundations Program

Abstract Foundational Inquiry requires more than a methodological principle. If foundational commitments are to become systematic objects of investigation, the inquiry directed toward them must itself possess a regulated internal structure. Without such structure, reconstruction research risks becoming a set of independent conceptual proposals lacking stable terminology, admissibility standards, dependency control, and cumulative comparability. This paper defines the constitutional structure of Foundational Inquiry. It does not introduce a new scientific theory, ontology, reconstruction, or formal system. Its purpose is to state the internal hierarchy through which the Foundations Program governs its own concepts, procedures, admissibility conditions, and formal operations. The constitutional structure consists of six ordered layers: the Foundations Program, the Foundational Thesis, the Reconstruction Lexicon, the Reconstruction Atlas, Constitutional Admission, and the Reconstruction Calculus. The order is not optional. Each layer receives its authority from those above it and constrains those below it. The Foundations Program defines the domain. The Foundational Thesis states the governing methodological principle. The Reconstruction Lexicon fixes the technical language. The Reconstruction Atlas maps the field of reconstruction. Constitutional Admission determines whether a proposed reconstruction may enter formal treatment. The Reconstruction Calculus formalizes only what has already been admitted. The central claim is that Foundational Inquiry becomes a disciplined research program only when reconstruction proceeds through this constitutional hierarchy. The hierarchy is therefore not an external organization of documents. It is the internal condition under which Foundational Inquiry preserves conceptual identity while allowing cumulative reconstruction research across disciplines.