The OSU teaching tool – Observe, Infer, Act – is intended for inte-grating diverse sources of information in the educational process in different subjects at different levels of educational system. It supports interactive work with a variety of information sources, both at the level of data as well such as management of devices. It is implemented as a server platform in the cloud, based on the platform Videk, used for capturing, managing and fusion of data sources in support to the OSU web service. Web service and mobile applications are, through HTML5 technology, extended with the functionality to capture data from various data sources and perform operations with the selected data sources. Testing, validation and integration of the tool into the educational process is carried out on the secondary and elementary school levels on the air quality monitoring use case and on the beehive monitoring use case.