Smart cities and their services are built on wireless and efficient use of data. In order to automate data production, cities invest in different sensor technology and seek the application of the Internet of Things (IoT) in service production in different industries and in serving customers. The challenge for cities is to understand IoT’s potential, information security and control over the whole to prevent data and technology segregation.Cities’ current IoT platforms and devices are not compatible, and data collected from systems and measuring devices cannot be fully utilised. Measurement data is too often left to one supplier, and the service is not necessarily available to everyone. Compatibility problems also create overlapping systems, as each service provider has to make its own system. The transformation of digitalisation also poses challenges for businesses. Open interfaces and an open data integration platform enable the breaking of supplier-specific silos and increasing collaboration between companies and product development. By networking, small companies are able to offer larger overall solutions to customers. The objective of the project is to define an open and independent Data Integration Platform and its interface conditions, as well as a uniform reference architecture-building IoT pilot environment-activating SMEs with pilots-enabled the use of IoT data in companies’ business-promoting the development of new wireless technologies-to speed up the implementation of national and international strategies (“digiloikka”) in FinlandThe project defines and conceptually independent reference architecture for the utilisation of IoT data. A key element of the project is pilots with companies, which define the needs of urban buildings, construction, education, housing and environment, as well as transport infrastructure, which can be met by IoT solutions. These pilots will develop a technical architecture to meet identified needs. Existing infrastructures will be used as far as possible in pilots. The project will create the conditions for up-to-date use of IoT in companies’ product development. The key driver is ‘actor independence’, which allows industry and supplier silos to be broken using a unified reference architecture and interface specifications. The project will build the necessary definitions and application architecture to identify cities’ IoT needs and develop solutions. Companies participate in pilots. The pilots allow companies to benefit from the new innovation environment as part of their own product development process. The project will develop new data-intensive service and business models. Visualisation of data is also important when it comes to illustrating things to end users. During the project, companies will be invited to participate actively in definition work, pilots and business model development. As a result, companies will be able to pilot their own products and receive feedback from customers in different product development phases. More efficient operating models will be created in cities, international pioneering solutions will be created to make use of IoT, and an active developer ecosystem will be built around the architecture created, through which companies can create their own solutions, strengthen their expertise and take the necessary measures to create different references. These measures will build internationally valued forerunner cities and companies new business and internationalisation opportunities as well as reference areas to showcase their know-how. The project enables the customisation of new services from open data to all residents of cities and thus equal treatment of residents. Based on open data, it is also possible to develop services for specific groups. In a technology-focused field, the gender balance differs from the general population when the developer population is usually male-dominated. Through technology, the project opens up the possibility of developing services for both genders through training and business pilots. Thus, the project will naturally involve both men and women in the production and usability of the service content.The open Data Integration platform enables a number of changes in the longer term and provides a basis for sustainable development. Data-based services contribute to the well-being of citizens, enable the optimisation of resources and thus cost savings, as well as the creation and analysis of different situations in support of decision-making.