Objectives The objectives of Task 35 "PV/Thermal Solar Systems" are to catalyse the development and market introduction of high quality and commercial competitive PV/Thermal Solar Systems and to increase general understanding and contribute to internationally accepted standards on performance, testing, monitoring and commercial characteristics of PV/Thermal Solar Systems in the building sector. Activities include international collaboration on scientific, architectural, and commercial aspects. Task Experts will be assigned from Universities, Technological Test Institutes for solar applications, and selected from engineers and architects in the field of building integrated solar applications, manufacturers of photovoltaic systems and solar thermal systems, building clients, financing bodies and marketing consultants with experience in the field of renewable energy. Means The objectives shall be achieved by the Participants in the following five Subtasks: Subtask A: Market and Commercialisation of PV/T Subtask B: Energy Analysis and Modelling Subtask C: Product and System Development, Tests and Evaluation Subtask D: Demonstration Projects Subtask E: Dissemination In Subtask A: Market and Commercialisation of PV/T the objectives are to investigate and identify the critical design parameters and commercial performance criteria, which determine the targets and conditions for successful new components and systems. The objectives will be achieved by the conduction of a market survey of potential markets for PV/Thermal Solar Systems in the participating countries and identification of the primary commercial parameters. The objectives of Subtask B: Energy Analysis and Modelling are to provide the necessary understanding of the energy transfer processes in PV/Thermal Solar Systems in order to define, to model and to predict the energy performance of the systems separately and in a whole building context. In Subtask C: Product and System Development, Tests and Evaluation the aims are to develop, test and evaluate PV/Thermal Solar System components and concepts and the experiences from products and components already on the market. The work includes R&D-activities in close collaboration with manufacturers of PV/Thermal Solar Systems in order to improve overall performance and solve generic problems with existing concepts and components. The aims of Subtask D: Demonstration Projects are to gain the knowledge from full-scale demonstration of PV/Thermal Solar Systems in order to verify and identify the potential for improvement of energy performance, expectations to reliability, durability and economical feasibility. This will be achieved by dialogue with project stakeholders, monitoring of selected projects and facilitation of workshops for design teams and task participants. Finally, the objectives of Subtask E: Dissemination are to provide efficient and targeted information of the task results to all stakeholders of the Task and to make this information available to the target audiences through various media and formats according to the preferences of the target audience.