ANNUAL POLICY REPORT 2012 Rapporteur on human rights of migrants; UN High Commission for the Refugees.  Amnesty International; International Organization of Migration.  NGOs and Refugees) migrant organizations (METADRASI, Greek Council for  Daily or periodical press, in Greek or other language, in print or in electronic form. In cases that contact with the responsible Ministry was essential for obtaining the required information, a letter was initially sent through e-mail, where the purpose of the requested data was explained. In most of the cases a follow-up, mostly oral, contact was required, before the requested data was sent by the responsible authority. In general there were no particular delays in respect to the communication with the responsible authorities or misunderstandings as regards the actual content of the provided data and information. Nevertheless, variations regarding the response-time for providing the requested statistical data were observed depending on the agency, especially in cases that the headquarters of an agency had to collect and sort/clear the statistical data from its regional services. The process of restructuring the public administration also coincided with these requests and affected the pace of the data-collection phase. Α2. Terms and Definitions. During the systematic and extensive research, which was conducted with the view to cover all the spectrum of migration and asylum issues, as well as during the contact with officials and representatives of the stakeholders, no substantial variation of the relevant terms as defined in the Glossary of the European Migration Network came to our understanding. Ambiguity was prima facie ascertained as regards the detention centers, because in the public discourse the terms 'centers of temporary/closed accommodation', as well as the term 'pre-departure centers' were alternatively used. All the aforementioned terms refer to facilities, where arrested irregular migrants are held until they are deported. Furthermore, a differentiation was observed regarding the meaning attributed to the term ‘vulnerable groups’ by the various authorities, resulting sometimes to a very exclusive form of the term at stake. 72