Following the publication, in October 1996, of the Green Paper on obstacles to transnational mobility in education, training and research, the Commission has opened a Web interface to ensure the widest possible response to the Green Paper. The aim of the Green Paper is to address the various obstacles which restrict the freedom of movement of Community citizens wishing to train, undertake research or do voluntary work in another Member State. Whilst rights are well established for those undertaking full-time work, for those wishing to spend a limited period in a second Member State there are a number of barriers and disincentives. The Commission wishes to discuss these with a view to reducing their impact. The Green Paper addresses questions such as tax and social security, residence rights, transferability of grants and recognition of qualifications, as well as looking at specific situations such as trainees on company placements, or third country nationals resident in a Member State. In respect of holders of Marie Curie research training grants, awarded by the Community's Training and Mobility of Researchers (TMR) programme, the Commission calls on Member States to harmonize treatment of these grant-holders, ensuring that no part of the grant is paid out in social security or tax contributions. The full text of the Green Paper may be downloaded from the World Wide Web, while comments may be submitted electronically or in writing.