Wireless communications via optical, unguided carriers opens up new horizons of information and communications (ICT) technologies. Up to now, radio-frequency (RF) based systems have been dominating wireless communications. The RF bands, however, have to accommodate a large variety of communication devices and modes. At the same time, there is a huge amount of unregulated bandwidth available in the upper portions of electromagnetic spectrum. In this context, wireless, unguided optical transmission systems utilizing the largely unexploited portion of the spectrum frequencies are highly promising.Designing future optical wireless system solutions calls for research and development (R&D) efforts. The DETERMINE project develops concepts, models, algorithms, and architecture for free space communication over the optical spectrum. To this end, the project follows the approach of intensive knowledge exchange and competence integration between the partners of the consortium.Optical wireless communications systems are expected on rely on a layered structure, and solution integration across layers is highly desirable. Toward this end, DETERMINE is built around combining knowledge and know-how via exchange of expertise from the physical layer, medium access, network optimization, to end applications.In addition to technological development, DETERMINE contributes to skill acquisition by training early-stage researchers. The knowledge transfer actions are built on a mutual-beneficial basis between the two European partners and the Chinese partner. DETERMINE also implements knowledge exchange with other European efforts in the area, particularly with COST Action IC1101. For the European Research Area (ERA), the exchange actions foster human capital to simulate career development of young and talented researchers in European ICT.