Citation analysis investigates the number of times an article or an author has been referred to by others in the field of scholarly literature. It can be used to judge the impact an author or a publication has had upon its peers. FAO staff members often use citation analysis as part of the auto-evaluation process.
Historically, the only tools available for citation analysis are ones such as the (extremely costly) ISI Web of Science or the Elsevier Scopus database. We here at FAO do not have access to Web of Science, but we do have a subscription to Scopus. Having access to either of these databases does not answer every need that we have at FAO, however. Due to the nature of the type of publications that FAO produces, many of them are just not searchable in the usual places.
I just recently witnessed the demonstration of a citation analysis tool called Publish or Perish that looks to be promising for FAO staff who are looking to judge the effectiveness of their work. This tool is free to download, and it runs on input from Google Scholar. As I mentioned above, no citation analysis tool is without flaws, however, Google Scholar may provide insight into the kind of publications produced by FAO that often fall between the cracks of the traditional analysis tools.
Publish or Perish calculates statistics based on the following metrics:
Total number of papers
Total number of citations
Average number of citations per paper
Average number of citations per author
Average number of papers per author
Hirsch's h-index and related parameters, shown as h-index and Hirsch a=y.yy, m=z.zz in the output
Egghe's g-index, shown as g-index in the output
The contemporary h-index, shown as hc-index and ac=y.yy in the output
Two variations of the individual h-index, shown as hI-index and hI,norm in the output
The age-weighted citation rate
An analysis of the number of authors per paper
You can read a detailed comparison of Google Scholar with ISI Web of Science here.