Interoperability in the public sector
Interoperability is the ability of different information systems to exchange data, understand it in the same way and use it in practice for common processes. In simple terms, it means that one system does not only “pass a file” to another, but also ensures that the recipient knows what the data mean, how to process it and when it can be relied on. In the public sector, this is especially important because residents expect organisations to work together and not ask for the same data several times.
For municipalities, schools, libraries, museums and other public bodies in the EU, interoperability helps create more convenient, faster and more reliable services. When systems work in a coordinated way, a resident can submit an application electronically, and the necessary data about a declared place of residence, legal status or other information are obtained from the relevant registers and systems. This is one of the key foundations of the “single point of contact” principle.
Main levels of interoperability
Interoperability is not just a technical issue. For data exchange to work smoothly, several interconnected levels need to be aligned.
- Technical interoperability
This level covers data formats, integration methods, API interfaces, protocols and secure data transmission. If one system provides data in a structured form and another can automatically receive and process it, manual work, errors and service delivery disruptions are reduced. In the case of municipalities or education organisations, this is important when integrating document management, registration, e-services or content management systems.
- Semantic interoperability
It is not enough just to transmit data — both systems must understand its meaning in the same way. For example, if a field in one system means the actual address and in another the declared place of residence, incorrect interpretation may cause errors in service delivery. That is why clear data models, classifiers, consistent names and descriptions are important.
- Organisational interoperability
Data exchange between organisations is based not only on technology, but also on agreements, responsibilities and processes. It is necessary to define clearly who provides the data, for what purpose they are used, how often they are updated and who is responsible for their quality. This is relevant both for local authorities and for subordinate organisations when different departments or organisations share information about resident services, registration or service delivery.
Why is interoperability important for the public sector in the EU?
Public-sector organisations often work with the same or related data, but in different systems. If these systems do not communicate with each other, the resident has to collect certificates themselves, fill in repeated forms and wait longer for the application to be processed. Interoperability allows organisations to use already available data responsibly and lawfully when there is a basis for doing so.
For example, a municipality can obtain the necessary information from state registers or other information systems instead of asking the resident to provide documents that the state already holds. For schools, this can mean a smoother admissions process, for libraries more accurate reader registration, and for museums more effective linking of ticketing, educational activities or visitor information systems with other digital solutions. The fewer redundant steps there are, the more convenient the service is for both staff and residents.
Benefits for organisations and residents
- Less administrative burden
When data are received automatically from trusted sources, staff do not need to retype or check them in multiple documents. This saves time and allows more attention to be given to the service itself rather than technical administration.
- Faster and more convenient services
The resident does not need to provide additional information that is already in state systems, so submitting applications becomes simpler. Electronic services can be delivered more smoothly, and response times can be shorter.
- Fewer errors
Automatic data exchange reduces the risk that information will be transferred inaccurately from one system to another. This is especially important where data accuracy has a direct impact on decisions, for example when registering applications, issuing certificates or administering services.
- Greater transparency and traceability
Well-designed integrations make it clearer where the data came from, when they were updated and on what basis they are used. This helps ensure better internal control and accountability for data processing.
Interoperability and GDPR
Data exchange in the public sector must be organised responsibly, in compliance with GDPR, national legislation and sound data governance principles. Interoperability does not mean that all systems can freely share any data whatsoever — on the contrary, the legal basis, the purpose of data use and access rights must be clearly defined. Organisations must ensure that only the data needed for a specific function or service are transferred.
Security is also important: authentication, access control, data encryption, activity logs and clear responsibilities. If a municipality, school or other organisation is implementing new integrations, it is worth assessing in advance how data subjects will be informed, what the retention periods will be and how incidents will be managed. Properly planned interoperability helps not only to work more efficiently, but also to comply with legal requirements.
Accessibility and user experience
Interoperability is often associated with internal processes, but it also directly affects the resident experience. If systems are well connected, electronic services can be simpler, forms shorter and the user does not need to enter the same data repeatedly. This is especially important when creating digital services that must be clear and accessible to all users, including people with disabilities.
In public-sector websites and self-service solutions, it is important to combine interoperability with accessibility requirements. Even a technically advanced integration will not be useful if the resident cannot conveniently complete the form, understand system messages or use the service on a mobile device. Therefore, data exchange should be planned together with a clear information architecture, plain language and a convenient user interface.
What should be considered when planning interoperability?
For organisations modernising websites, e-services or internal systems, it is worth assessing in advance not only technical capabilities, but also process readiness. It is important to understand what data are needed, from which sources they will be obtained, who will be responsible for maintaining the integrations and how changes will be managed in the future.
In practice, this means that interoperability should be planned as a long-term part of digitalisation, not a one-off technical solution. The clearer the data flows, responsibilities and standards, the easier it is to ensure service quality, compliance with requirements and future system development.
Summary
Interoperability is one of the most important conditions for a modern, convenient and efficient public sector. It enables organisations to work together, reduces administrative burden, improves the resident experience and helps to implement the development of digital services. For municipalities, schools, museums, libraries and other organisations in the EU, this means not only technological progress, but also more mature and responsible data management.
When interoperability is implemented thoughtfully — taking into account security, GDPR, accessibility and the real needs of users — it becomes a solid foundation for high-quality public services. That is why it should be seen not as a narrowly technical term, but as an essential part of modern public-sector digitalisation.