Änderungsanalyse in den Suchergebnissen einer fachspezifischen Recherche mit den Suchmaschinen Google und Scirus: Vergleich der Jahre 2004 und 2005 für eine Fragestellung aus dem Bereich der Biotechnologie / Changes in query results from selected search engines over a time span: a comparison between 2004 and 2005 for a specific search in the field of biotechnology

Aim of this work was the analysis of the changes occurring in hit lists of selected search engines at two different points of time.The same search query was applied to the search engine Google and to the science search engine Scirus in August 2004 and in April 2005. The first 40 hits of each search have been analysed on the basis of predefined qualitative and quantitative parameters. Further an analysis of overlapping between search hits at the above mentioned time points has been carried out for each search engine separately. The results of this study has shown on one hand the existence of positive trends in the result lists of both search engines (less dead links, a higher precision in results) and on the other hand the role played by search engines themselves in the dynamic of result lists. The method applied here has shown to be useful for describing and measuring trends and changes in the search results of search engines over a time span