How google evaluates search – Google engineer talks

How google evaluates search:

Scott of Google has given a good insight of how Google evaluates search results: Look at this to get a good idea on how Google handles search evaluation:

“Evaluating search is difficult for several reasons.

• First, understanding what a user really wants when they type a query — the query’s “intent” — can be very difficult. For highly navigational queries like [ebay] or [orbitz], we can guess that most users want to navigate to the respective sites. But how about [olympics]? Does the user want news, medal counts from the recent Beijing games, the IOC’s homepage, historical information about the games, … ? This same exact question, of course, is faced by our ranking and search UI teams. Evaluation is the other side of that coin.
• Second, comparing the quality of search engines (whether Google versus our competitors, Google versus Google a month ago, or Google versus Google plus the “letter T” hack) is never black and white. It’s essentially impossible to make a change that is 100% positive in all situations; with any algorithmic change you make to search, many searches will get better and some will get worse.
• Third, there are several dimensions to “good” results. Traditional search evaluation has focused on the relevance of the results, and of course that is our highest priority as well. But today’s search-engine users expect more than just relevance. Are the results fresh and timely? Are they from authoritative sources? Are they comprehensive? Are they free of spam? Are their titles and snippets descriptive enough? Do they include additional UI elements a user might find helpful for the query (maps, images, query suggestions, etc.)? Our evaluations attempt to cover each of these dimensions where appropriate.
• Fourth, evaluating Google search quality requires covering an enormous breadth. We cover over a hundred locales (country/language pairs) with in-depth evaluation. Beyond locales, we support search quality teams working on many different kinds of queries and features. For example, we explicitly measure the quality of Google’s spelling suggestions, universal search results, image and video searches, related query suggestions, stock oneboxes, and many, many more.”

Source: Google Blog: http://googleblog.blogspot.com/2008/09/search-evaluation-at-google.html

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