Free access to knowledge is a central module within the context of Science 2.0. Rapid development within the area of Open Access underlines this fact and is a pathfinder for Science 2.0, especially since the October 2003 enactment of the “Berlin Declaration on Open Access to Knowledge in the Sciences and Humanities”.
The past years have shown that Open Access is of high relevance for all scientific areas but it is important to see that the implementation is subject-tailored. In all journal based sciences two both well-established and complementary ways used are “OA gold” and “OA green”. These two ways offer various advantages that enhance scientific communication’s processes by allowing free access to information for everybody at any time.
Furthermore, it is necessary to break new ground in order to expand, optimize, and ensure free worldwide access to knowledge in the long run. All involved players need to re-define their role and position in the process. This challenge will lead to new, seminal solutions for the sciences.