Most of them come down to a rejection of majority voting in particular policy areas.
Nobody is sure how the move to majority voting will combine with co-decision for the parliament.
Another prerequisite to expansion is the extension of qualified majority voting (QMV) in the European Council.
It would expand the policy areas subject to qualified majority voting (QMV), rather than unanimity.
One possible explanation for the superiority of committees is that majority voting cancels out the worst performers.
The Council of Ministers uses a system of weighted qualified-majority voting in which small countries are heavily over-represented.
Although this double-majority voting system for the EBA sounds boringly procedural, it could prove to be very significant.
The argument goes that more majority voting is needed, because few decisions requiring unanimity will survive 27 potential vetoes.
EU-wide taxes should be decided by qualified majority voting among the Union's countries.
Some officials maintain even so that it is the existence of majority voting, not its use, that makes agreement easier.
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President Barack Obama, a senator at the time, joined in the narrow majority voting to end the program after five years.
Some institutional changes might make it easier to reach common positions, and some majority voting might help to rally recalcitrant countries.
The shift from unanimity to majority voting is a big political change.
Going into the summit, the British insisted that they were making progress in eradicating any hint of majority voting in these red-line areas.
Years ago Mr Kohl was demanding firm progress towards European political union (including majority voting) in return for German consent to the euro.
Qualified-majority voting means, at present, that a proposal must get at least 62 out of 87 possible votes (ie, a 71% majority) to pass.
The Dutch suggest some majority voting in foreign policy, for example.
"The cause of reform, so long fought for, cannot afford to have the fundamentally fair and historic principle of majority voting cast aside, " the historians write.
However, smaller nations in the EU are concerned that majority voting on a new EU bailout fund would give too much power to France and Germany.
The number of new topics to be made subject to majority voting was, he said, too few to enable an enlarged Union to make decisions quickly.
Supporters of deeper political and economic integration like majority voting because it makes it harder for less enthusiastic countries to dissent, or to slow legislation down.
For example, the leaders were willing to move to majority voting in around half of the 50-odd areas where France believed unanimity need no longer be essential.
Soon afterwards, the case for replacing national vetoes with majority voting was made by federalists, who claimed, often wrongly, that the new members had rendered EU institutions unwieldy.
EU's members support the extension of majority voting in principle.
The Italian government, as president of the European Union, published its latest draft of a new EU constitution , including a proposal for some majority voting on foreign policy.
Labour is also likely to give up Britain's veto rights to EU-proposed legislation and move towards majority voting in some areas, a form of decision-making favored by the rest of Europe.
The fiercest arguments will probably come over qualified-majority voting.
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