VW's board is set to formally approve its merger with Porsche later this week.

Although the merger has long been anticipated, VW's board will sign-off legal documents outlining the takeover. The documents are said to be thousands of pages long.

The owners of Porsche, which has been weakened by mounting debt, will then sign-off the documents, kick-starting the merger of the companies.

This will begin with VW buying a minority stake in the Porsche sports car business, and extend to be a full merger by 2011.

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