The International Conference "Berlin 5 - From Practice to impact. Consequences of knowledge dissemination", held in Padua from September 19th to 21st, confirmed that Open Access is a clear concept, but a complex reality, as it is a matter of digital access, of economics sustainability, of quality, of infrastructures, of policies. Following the topics pointed out in the speeches, this contribute tries to match the Open Access strategies - self-archiving and publishing in OA journals - with the current or possible behaviours of the agents involved - authors, institutions, libraries, publishers, readers - in order to draw a framework of the works in progress and to outline viable pathways, given that each science is "a" science, and has its own communication tools.