VYAN, surface by surface.

Other systems build digital twins of factories, products, or networks. VYAN builds a Decision Twin: a continuously-calibrated model of how your enterprise decides — every decision's inputs, its objective function, its constraints, its alternatives, its lineage, its resilience under variability, and the policy it obeys.

Every other surface in VYAN — the Substrate, the Solver, the Decision Policy, the Response Layer, the Learning Loop, SAGE — either feeds the Twin, configures the Twin, or surfaces what the Twin is doing.

The Substrate is the part of VYAN you see first when you start a deployment. It is the data model your decisions are made from — organised as 46 dimensions, with typed source dimensions for procurement, production, transport, and inventory. Other planning tools model supply as a single abstraction; VYAN models it as the four distinct decision surfaces it actually has.

The Substrate is versioned. Every change is publishable, reviewable, and rollback-able. This is the layer that makes VYAN auditable to the CIO and defensible to the auditor.

Enterprise Optimization (formerly named The Solver) is the math engine. It takes the Substrate and the Decision Policy and produces decisions — not plans. It runs concurrent multi-horizon optimization across all decision classes (procurement, production, transport, inventory, allocation, promising, expediting) against a multi-objective function the buyer authors.

Most planning systems run sequential single-objective solves. Enterprise Optimization runs one pass against all objectives with stated trade-offs. The output is the Pareto frontier — the set of solutions that no other solution dominates. The Decision Policy picks the point on the frontier.

The Decision Policy is the most important artifact VYAN produces. It is the explicit, governed, versioned statement of how your enterprise decides — not buried in tribal knowledge, not negotiated in meetings, not hidden in spreadsheets. The policy says: under these conditions, decide this way. Under these other conditions, escalate.

Every Decision Policy is authored by humans, governed by Governance Policies, improved by champion-challenger experiments, and audited by SAGE. When the world moves, the policy holds — not because nothing has changed, but because the policy was written to anticipate change.

Most planning systems emit decisions on a cycle — weekly, monthly, quarterly. Between cycles, the world moves and the plan stales. The Response Layer eliminates the cycle. Events are sensed, classified, scored for impact, and responded to within the bounds of the Decision Policy — continuously.

When a response requires a replan, the Response Layer sizes the minimum impact radius. The replan touches only the decisions that materially change. The rest of the plan stays committed. This is what surgical replan means.

VYAN closes the loop. Every decision is logged. Every outcome is measured. Every gap between predicted and realised outcome feeds back into the Decision Policy through champion-challenger experimentation. Master-data drift heals through driver calibration. Policies that no longer hold get retired.

This is what makes VYAN compound over time. Year-one policies are good. Year-three policies are better, because the system has seen three years of how the world actually behaved.

SAGE is the conversational surface that translates between executives and the Decision Twin. The CFO asks SAGE about working capital. The CSCO asks about expedite freight. The COO asks about supplier risk. SAGE answers from the same Twin, with the same math, with citations to the underlying decisions and policies.

SAGE also remembers. The Institutional Memory captures the why behind decisions — not just the what. When a new planner joins, they inherit the context. When the CFO asks "why did we expedite that order in March," SAGE can answer.

Admin is what the CIO will want to evaluate during PULSE — not before. Workspaces, Identity, Platform Health, Calendars, Integration, Solver Pool, Feature Flags, Subscription Scope. The names alone signal that VYAN is real enterprise software.