Acquisition of experimental data by space mission measurements and interpretation of these data on the basis of developed theoretical concepts and models are two major mutually connected aspects of the modern space research. Numerical modelling, as a way to reproduce complex natural phenomena and to understand them by computational simulation, plays here an important role. By this, the observational data on one hand are considered as a verification test for validity checking of existing models, on another hand they appear a driver for further improvement of existing models and development of new ones. At the same time, the scientific potentials of the combined use of experimental data and numerical models in their mutually complimentary way are still not realized. Creation of an integrated IT framework where numerical models are interconnected to the experimental data and used in combination with the last for simulation of space phenomena and interpretation of measurements, provided by space missions is an actual task. Recently started EU FP7 project IMPEx (Integrated Medium for Planetary Exploration) is aimed at making progress on that way. The splinter session is going to serve the establishment and stimulation of cooperation between observers, numerical modellers, as well as data resource developers and providers. Representatives from these fields, as well as all interested in the subject, are kindly invited to take part in the session which will be organized in the form of an open discussion and opinions exchange between participants.