World leaders gathered in Washington are set to agree Saturday to stimulate the world economy, implement new international regulation of the financial sector and reform global governance, according to a high-ranking source in the French presidency.

The leaders at the G20 meeting here, whose countries make up 85 percent of the world economy, are to issue a five-page final communique committing them to these principles and will then review progress on March 31, the source said.

A second G20 summit will be organized between March 31 and April 30 at a location that has not yet been decided.

The communique will have `positive messages in three ways: support for the economy, new international regulation and reform of global governance,` the source told AFP.

`This text has the essential charactistic, for which we fought for a longtime, of trying to be as concrete and as precise as possible,` the source said.

`Beyond the communique of five pages, there is a detailed action plan in which there are a series of measures and regulations that are stressed and ordered with objectives, with a final date of March 31, 2009.`

The comminique will underline the commitment of countries to launch simultaneous efforts, including tax and spending stimulus plans, interest rate reductions and support of the International Monetary Fund and development banks for vulnerable countries.

The message would be `we won`t leave any country behind,` said the source.

`Everyone sees that one of the ways the crisis can develop is the risk of transmission of the crisis by the fall of a country,` he said.