The following article was published in the Wall Street Journal:

“Yahoo Inc. engineers began testing keywords in Microsoft Corp.’s search advertising system for the first time last week, a key step toward implementing a comprehensive search agreement the two companies hope will reshape the industry.

The so-called “shadow tests” replicate how keywords will perform when Yahoo’s advertisers are plugged into Microsoft’s adCenter system, which will soon power the paid search businesses of both companies. The test results will help determine whether Yahoo and Microsoft can flip the switch on their unusual partnership this fall, as they hope.

“The next couple of weeks are going to be critical,” said David Karnstedt, who runs search engine marketer Efficient Frontier”