Open government is the governing doctrine which holds that citizens have the right to access the documents and proceedings of the government to allow for effective public oversight. In its broadest construction it opposes reason of state and other considerations, which have tended to legitimize extensive state secrecy. The origins of open government arguments can be dated to the time of the European Enlightenment.
Open Government Partnership or OGP is an international organization promoting multilateral initiative and seeking strong commitments from participating government institutions to promote transparency, increase civic participation, fight corruption, and harness new technologies to make government more open, effective, and accountable.
The first step towards full OGP participation is meeting the OGP eligibility criteria. In order to be eligible to participate in OGP, governments must demonstrate a minimum level of commitment to open government principles in four key areas (Fiscal Transparency, Access to Information, Income and Asset Disclosures, and Citizen Engagement).
Link: http://prezi.com/okqs-l6tyvtk/what-is-and-what-is-not-open-government/