Open Government Data (OGD) initiatives, and in particular the development of OGD portals, have proliferated since the mid-2000s both at central and local government levels in OECD and non OECD countries. Understanding the preconditions that enable the efficient and effective implementation of these initiatives is essential for achieving their overall objectives. This is especially true in terms of the role played by OGD in relation to Open Government policies in general. ... http://www.oecd-ilibrary.org/governance/open-government-data_5k46bj4f03s7-en -- http://www.eellak.gr/, http://mycontent.ellak.gr/, http://www.creativecommons.gr/, http://mathe.ellak.gr/, http://fablabathens.gr/