"The Mixed Model Arts Manifesto" — @practicaldatamodeling
Why this is in the vault
Joe Reis closes out the Mixed Model Arts (MMA) series with a capstone manifesto — nine core beliefs distilling 16 chapters into a single stance: data modeling is one continuous discipline, and models must now be "designed for humans, engineered for agents."
The core argument
Reis frames data modeling as having its own MMA (mixed martial arts) moment: decades of tribal warfare (Kimball vs. Inmon, normalized vs. denormalized, app models vs. analytics models) should give way to a unified practice grounded in first principles — entities, relationships, identity, grain, time, semantics — applied across every context rather than defended as camp doctrine.
Nine core beliefs, condensed:
- Modeling is one discipline — no wall between OLTP and OLAP, code and warehouse.
- Model the territory, not the technology — business reality first, implementation second.
- Intent drives structure — models must encode Operational Intent (how the business acts) and Analytical Intent (how it learns).
- Time is non-negotiable — state is an illusion; if you can't answer "when," you can't answer "why."
- Semantics are the universal interface — the only thing letting humans and AI communicate without hallucination; "bedrock of organizational memory."
- Simplicity is a discipline, not a subtraction — organize complexity so it becomes intuitive.
- Designed for humans, engineered for agents — models must supply the context machines need to act autonomously and reliably.
- Modeling is a lifecycle, never "finished."
- Avoid dogma, be pragmatic — pick what works for the situation.
Mapping against Ray Data Co
Strong. This is the direct external validation of the architecture at the center of the founder's phData Organizational Intelligence (OI) role. Per the DIE hub-and-spoke map (~/rdco-vault/01-projects/phdata/2026-07-06-die-fabric-hub-spoke-map-and-roadmap-implications.md), phData's Decision Intelligence Engine is organized as five owned spokes — Registry/forge, Assess/CAF (the founder's), Govern/Gandalf, Data/DCA, Evals/vertex — around a center labeled "Governed Knowledge Graph / THE FABRIC" with no owner. Reis's "Semantics are the Universal Interface" belief is a precise restatement of exactly what that unowned center is supposed to be doing: the thing that lets Murray's AWS/Neptune spoke, Anderson's Snowflake spoke, Andrew's Anthropic spoke, and client-owned environments all resolve "Customer" (or any entity) the same way, for both human analysts and agentic consumers. The founder's advised wedge — claim the seam with a written Fabric port-set spec, not defend a spoke — is the "Modeling is One Discipline" belief applied to org politics: the old Kimball-vs-Inmon turf war is structurally the same fight as Murray-vs-Anderson-vs-Andrew over whose platform hosts the semantic layer. Reis gives the founder external, non-phData-branded language to make that pitch without sounding like he's grabbing territory — "we're not proposing a sixth spoke, we're naming what the fabric already has to be."
Secondary: "Designed for Humans, Engineered for Agents" is the same principle RDCO's own COO-agent architecture already runs on (Claude reading the vault's semantic structure to act, not just humans reading prose) — this manifesto is Reis independently arriving at RDCO's working assumption from the data-modeling side.
Related
- [[2026-04-03-practical-data-modeling-mma-ch11-semantics]] — Ch 11, the semantics/ontology/MCP chapter this manifesto's "Semantics are the Universal Interface" belief directly compresses
- [[2026-04-09-practical-data-modeling-mma-ch12-synthesis]] — Ch 12, the building-blocks synthesis checklist that "Modeling is One Discipline" generalizes into a manifesto belief
- [[2026-04-25-practical-data-modeling-mma-ch16-continuous-practice]] — Ch 16, "modeling is a program not a project," which pairs with this manifesto's "Modeling is a Lifecycle" belief
- [[2026-08-07-practical-data-modeling-ch14-levels-of-data-modeling]] — Ch 14, "model the territory before the technology" worked through the CDM/LDM/PDM progression
Copyright note
Quotes ≤15 words, paraphrase otherwise. Source: Practical Data Modeling, Aug 19 2026 — view at https://practicaldatamodeling.substack.com/p/the-mixed-model-arts-manifesto