In a nutshell, Open Science describes an on-going movement in the way research is performed, researchers collaborate, knowledge is shared, and science is organised. It affects the whole research cycle and its stakeholders, enhances science by facilitating more transparency, openness, networking and collaboration.
Open Science opens up scientific processes and products from all levels to everyone. As such it includes Open Access, Open Research Data, Open Methodology, Open Evaluation, Citizen Science.
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Open Access to publications is part of a broader movement toward Open Science. This movement states that science must be done in a transparent and reproducible fashion where all components of research are open.