Twinning has become the cornerstone of the European Union's assistance to Acceding, Candidate or Potential Candidate Countries. Recently, Twinning has also started benefiting countries included in the programme of enhanced co-operation (European Neighbourhood Policy countries). The original aim of Twinning was and largely remains to be the building of capacity of these countries to adopt, implement and enforce the full acquis communautaire before joining the European Union (EU).