The March 27, 2009 edition of Science explores the issue of personal identification numbers for scientists. Why? Because it's getting difficult to tell authors apart.

A universal numbering system could aid scientists trying to stay on top of the literature, help universities more readily track staff productivity, and enable funding agencies to better monitor the bang they're getting for their buck. An effective identification number might also make it easier to find information about an author's affiliations, collaborators, interests, or simply their current whereabouts.

This article indicates that published scientific papers are growing in quantity by 3% annually. Many authors are getting married or divorced and therefore changing their names. Some journals have varying style rules for noting first names and initials. Chinese authors often transliterate their names using opinion. "At least 20 different Chinese names, many of them common, are transliterated as "Wang Hong." And, of course, there are many scientists not of Chinese descent who have common names who don't want to be confused with others.