BIAN Explained: The Banking Industry Reference Model

Strategy-to-execution alignment

Enterprise architecture creates leverage when strategic priorities are translated into capability-level outcomes and delivery sequencing.

This requires a shared language between executives, architecture leaders, and delivery organizations.

• Define measurable capability outcomes tied to strategic goals
• Map cross-domain dependencies before portfolio commitment
• Review architecture assumptions at each roadmap increment

What BIAN is

BIAN — the Banking Industry Architecture Network — is a not-for-profit association of banks, technology vendors, system integrators and academics that maintains a shared reference model for banking architecture. Its purpose is to give the whole industry a common language for what a bank does, so that systems from different vendors can fit together with less custom integration.

The model's centrepiece is a service landscape: a structured catalogue of standardised banking capabilities. Rather than each bank inventing its own map of capabilities, BIAN offers an industry-agreed one. This primer paraphrases BIAN's core ideas; the authoritative source is the BIAN organisation's own published standard.

The service landscape and service domains

At the heart of BIAN are service domains — discrete, standardised units of banking capability, each with a clear boundary and responsibility. Examples in spirit include capabilities around payments, customer relationship management, lending, and position keeping. The service landscape groups these domains into business areas and domains so that the whole of a bank can be mapped at a glance.

The value of describing a bank this way is modularity. When capabilities are defined as standard service domains, you can reason about replacing one component without unravelling the rest, and you can compare what you have against what the market offers. That is the opposite of a monolith where everything is entangled.

• Service domains: standardised units of banking capability
• Business areas and domains: how those units are grouped
• A common vocabulary shared across banks, vendors and integrators
• A basis for modular, service-oriented landscapes rather than monoliths

Why a shared reference model lowers cost

Integration is one of the largest hidden costs in banking IT. Every time a core-banking platform, a payments engine and a fintech partner describe the same capability differently, someone has to build and maintain a translation. A shared model removes much of that friction.

When a bank and its suppliers all speak BIAN, the boundaries of each capability are agreed in advance. Replacing a component, onboarding a partner, or assembling a best-of-breed landscape becomes a matter of matching standard interfaces rather than reverse-engineering bespoke ones. The benefit compounds as the landscape grows.

How BIAN fits with TOGAF and ArchiMate

BIAN is not a competitor to TOGAF or ArchiMate; it operates at a different level. TOGAF is a method for running an architecture effort. ArchiMate is a notation for modelling it. BIAN provides the banking-specific content — a ready-made capability map — that those general tools can carry.

A practical pattern is to use a TOGAF-style cycle to structure the work, model the architecture in ArchiMate, and adopt BIAN service domains as the capability vocabulary so the model speaks the industry's language. You get method, notation and domain content working together rather than reinventing each.

Putting BIAN to work with Archilu

For a bank, the pragmatic path is to use BIAN as the capability backbone of the architecture: map your real systems and processes to standard service domains, then use that map to plan modernisation, partner integration and component replacement. You do not need to model every domain at once — start with the areas under active change.

Archilu supports a BIAN-aligned practice by holding the business capabilities, applications, data and technology in one connected model, so you can attach systems to service domains and trace dependencies and impact across them. For regulated finance this also helps with the documentation and traceability that DORA and CSSF expectations demand. To find your starting point, Archilu's free EA maturity assessment scores ten dimensions and returns a prioritised plan in about ten minutes, and the linked guides on enterprise architecture for banks and EA tooling for the financial sector turn the model into concrete next steps. BIAN is a trademark of the Banking Industry Architecture Network e.V.

Execution alignment KPIs

These indicators show whether architecture is improving strategic execution quality.

• Capability outcome attainment vs roadmap target
• Strategic initiative delay caused by architecture dependencies
• Architecture debt trend on critical value streams
• Portfolio re-prioritization speed after risk change

Common mistakes

Strategic architecture work fails when it is disconnected from delivery sequencing and budget decisions.

• Publishing target states without execution ownership
• No dependency mapping across initiatives
• No cadence for architecture refresh based on outcomes
• No explicit link between architecture debt and portfolio risk

Practical checklist

Use this sequence to connect strategy to execution outcomes.

• Translate strategic goals into capability-level outcomes
• Map dependencies across business, app, data, and tech domains
• Define architecture decision checkpoints in roadmap cadence
• Track progress with measurable delivery and risk indicators