Once ratified, the constitution for an enlarged EU would be able to take effect. That requires 25 countries' approval. Since a 'yes' from all at any one time is rare, the draft calls for simplified voting in EU decision-making:

From 2009, a "double majority" system in which most decisions would pass if backed by a simple majority of states representing 60 percent of the population.

Spain and Poland are fighting to keep the disproportionate voting powers they won in the last EU treaty, negotiated in Nice in 2000. It gave each of them nearly as much voting power as Germany even though each has a population less than half the size of Germany's.

The complex weighted voting system agreed at Nice gave Spain and Poland 27 votes each compared to 29 for the four largest states.

The difficulty is in satisfying national interests while avoiding policy paralysis in a bloc of nations.

Source: Euro News at:
http://www.euronews.net/create_html.php?page=detail_europa&lng=1&option=6,europa