The Convention on the Future of Europe has reached agreement on a draft EU constitution.
Valéry Giscard d'Estaing is to present the adopted draft to EU heads of Government next week at a summit in Thessaloniki in Greece.
Then the various countries will hammer out a final agreement in an Inter-Governmental Conference, starting in October and lasting several months.
The Taoiseach has said he is 'happy enough' with proposals from the Convention on Europe creating a two-tier Commission.
Mr Ahern said that Ireland's main concern was equality of treatment between member states, and as long as that held, he would be satisfied.
Ten new member states are due to join the European Union next year during Ireland's Presidency of the EU, but Croatia is still on the waiting list.
Today, the Croatian Prime Minister Ivica Racan was in Dublin to open an embassy, and for talks with the Taoiseach about their application to join the Union, which was made this Spring.
Bertie Ahern promised Ireland's full support, but both leaders were also keeping an eye on developments in Brussels, where the Convention on the Future of Europe is wrapping up its work.
One issue of concern for smaller countries is whether they will retain their right to a Commissioner in an expanded Europe.
The latest proposal is for a two-tier Commission, with every country represented, but with only 15 having a vote at any one time.
But the Taoiseach is happy, because each country will have an equal right to have one of the voting seats. Mr Ahern said he believed there would not be too many areas of disagreement.
The texts prepared by the Convention are on its website
