Challenging time for Google Quality Score?

Looking to the future of Google AdWords, Quality Score is likely to be a "huge challenge" due to its complexities, according to one commentator.

SEO Book's Aaron Wall recently had the opportunity to interview Andrew Goodman, author of books including Winning Results with Google AdWords - and a man that Mr Wall calls the world's number one Google AdWords expert.

In the interview, Mr Goodman stated that the Quality Score algorithm was a "fascinating piece of work".

"Google is not content to stop at click-through rates as a factor for ad ranking; nor are they content to stop at landing page and website quality," he said.

Mr Goodman added that the search engine was looking at relevancy signals in "quite a radical way".

And in the future, he noted that Google would expand into print, mobile, radio and television media.

Google has already put a particular focus on mobile search and earlier in the week launched AdSense for mobile search.

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