Google will make a significant push toward integrating results from a variety of its search engines in an attempt to deliver as relevant and comprehensive a result set as possible to search queries.

Although Google and its competitors have been moving in this direction for years, Google's announcement on Wednesday is its clearest and most concrete statement of direction yet regarding its efforts in this area. The announcement was made by Marissa Mayer, Google's vice president of search products and user experience, at an event in the company's headquarters in Mountain View, California.

Internet search providers like Google, AOL, Yahoo and Microsoft offer, in addition to their general Web search engines, a set of specialty engines that deliver only news articles, photos, local business listings, blog postings, maps and video clips.

These companies have long recognized that it is highly inconvenient for users to have to use different engines for the same query, particularly because it is often relevant to see, for instance, Web pages, images and maps to satisfy searches.

Moreover, studies have shown that many people don't even realize that these companies have specialty search engines beyond their main Web search sites.

Thus, Google and its competitors know that in order to improve the average user's search experience, they need to collate results from their different engines. As the operator of the world's most popular search engine, Google has probably more riding on this than any of its competitors. Almost all of Google's revenue is generated from ads it runs along with its search engine results.

To that end, Google on Wednesday announced it is resolutely moving toward what it calls a "universal search model," while acknowledging it is still far from where it wants to be in this area, which is to deliver a single set of results culled from all its engines.

Results of this effort will be often subtle and gradual, the company warned. As part of the effort, Google is implementing a new technical infrastructure able to handle the intensive computational tasks involved in providing integrated results. An upgrade to the results ranking mechanism is also being rolled out.

Google's competitors have also begun integrating results from their engines in various ways and with different approaches, but with the same goal in mind: improve the search experience for users.

Google also updated its homepage design and tweaked navigation features to accommodate the collated set of results.

Finally, for those interested in learning of Google's latest experiments, Google has released a service called Google Experimental available on its Labs site.