In response to Dstl’s recent case study, “Dstl overcome challenges of interoperability with new software”, the Single Information Environment (SInfoE) programme provides a powerful, real-world demonstration of how those principles can be delivered in practice. The case study highlights the importance of modern software approaches, open architectures and interoperability over integration. SInfoE shows how these ideas translate into operational capability at scale, across live systems, multiple domains and international partners.

The SInfoE programme has been a strong example of how the Ministry of Defence (MoD) and Small and Medium-sized Enterprises (SMEs) can collaborate to create tangible benefits through the MoD's research budget. Nexor, acting as Dstl’s key delivery partner since 2021, has played a central role in shaping and delivering this capability. During that time, we have led much of the technical direction, coordinating the work of other SMEs alongside major prime contractors to ensure a coherent, scalable and enduring architecture.

One of the most significant milestones was Exercise ACHERON, the largest demonstration of uncrewed and autonomous vehicles (UxV) interoperability conducted by MoD to date. The exercise proved that tracks, Cursor on Target (CoT), imagery and Health and Usage Monitoring Systems (HUMS) data could be discovered and shared between more than a dozen disparate systems in a live operational environment.

Since then, further development has seen the number of in-service systems more than double, including those owned and operated by NATO, Norway and the United States. This growth reflects the strength of the underlying architecture. New systems can be added without re-engineering the entire environment, which is essential for coalition operations and the rapid evolution of capability.

Interoperability rather than integration

A central theme of Dstl’s case study is that traditional integration approaches struggle to scale, adapt and endure. SInfoE directly addresses this by being designed for Multi-Domain Interoperability, not point-to-point integration.

Integration tightly couples systems together, creating fragility, high change costs and long-term technical risk. Interoperability allows systems to remain independent while collaborating through shared rules, standards and interfaces. This distinction is subtle, but critical, and it is one of the reasons the SInfoE programme has succeeded where many others have struggled over the last two decades.

A useful way to understand Multi-Domain Interoperability is through the analogy of an orchestra. Each sensor or weapon system is an instrument: highly capable and independent. The architecture is the musical score, defining common standards, data formats and timing rules. Command and Control is the conductor, setting intent, tempo and priority.

If a new system can read the score and keep time, it can immediately join the orchestra. Without that shared score, each instrument may perform well on its own, but the collective effect is lost. Multi-Domain Interoperability is about designing and governing the score, so the whole force performs as one.

This is exactly the challenge highlighted in Dstl’s case study, and SInfoE shows how it can be overcome in practice.

An API-first architecture in action

Another way of looking at Interoperability and some of the guiding principles we followed are:

• All systems expose their data and functionality through service interfaces;

• Systems communicate with each other only through those interfaces;

• All communication takes place over the network;

• The underlying technology does not matter, whether HTTP, publish–subscribe, CORBA or bespoke protocols.

This API-first model is central to the success described in Dstl’s case study and foundational to the SInfoE architecture. It creates a stable contract between systems, allowing technology to change without breaking interoperability.

Crucially, service interfaces can also be developed for legacy platforms. This protects existing investment, extends the life of operational systems and avoids unnecessary replacement programmes. It enables MoD to exploit what already works while still embracing innovation and new suppliers.

Enabling Defence Reform and SME engagement

The SInfoE has been developed at a time of significant change within defence. MoD is seeking greater agility, faster delivery and closer engagement with SMEs and non-traditional suppliers. An interoperability-first architecture directly supports these goals.

It:

• Eliminates tight coupling between systems;

• Reduces delivery and integration risk;

• Enables faster onboarding of new suppliers;

• Encourages innovation and competition;

• Avoids vendor lock-in.

This makes SInfoE not just a technical programme, but a strategic enabler of Defence Reform. It provides an architectural foundation that supports continuous capability evolution rather than large, high-risk integration cycles.

Turning principle into operational capability

Dstl’s case study rightly emphasises that interoperability is as much an architectural and governance challenge as it is a technical one. SInfoE demonstrates how those principles can be applied at an operational scale:

• Across multiple domains;

• Across live, in-service systems;

• Across coalition partners;

• Across rapidly evolving technologies.

It shows that true Multi-Domain Interoperability is achievable when architecture is treated as a strategic capability, designed for longevity, assurance and adaptability from the outset.

From architecture to advantage

The Dstl case study sets out a compelling vision for overcoming long-standing interoperability challenges through modern software and architectural thinking. The Single Information Environment (SInfoE) programme shows how that vision can be realised in practice. By prioritising interoperability over integration, adopting an API-first approach and enabling continuous evolution, SInfoE provides a blueprint for how future defence systems can be designed, delivered and sustained.

At Nexor, this is our core area of expertise. We specialise in secure, high-assurance architectures that enable trusted information exchange across complex, multi-domain environments.

If you are facing challenges around interoperability, legacy systems or secure information sharing, and need support turning architectural principles into operational reality, we would welcome the opportunity to talk. Please contact us to discuss how we can help you solve these problems.