Technical unity in multiplicity is a key elementary applied linguistic primitive. Conceptually, it derives from the relation between the technical and numerical modalities. We examine order or system in designed language interventions on the norm side, and the unity of technical subjects and objects on the factual side. Design teams represent a union of technical subjects working to design an integrated solution. The value of this kind of analysis for designs of language plans, courses and tests lies in a fundamental principle of design: that of achieving a technical unity in multiplicity, a normative starting point for designing with integrity. [For the complete volume, "A Theory of Applied Linguistics: ?magining and Disclosing the Meaning of Design. Educational Linguistics. Volume 65," see ED672528.]