This straightforward and informative site from the Museum of Paleontology (UCMP) at the University of California at Berkeley offers an excellent introduction to Phylogenetic Systematics, the reconstruction of "the pattern of events that have led to the distribution and diversity of life." The site is organized into several sections, addressing "the philosophy, methodology, and implications of cladistic analysis." Descriptive summaries are made more useful with links to the UCMP Glossary of Phylogenetic Terms, and interested users may seek greater depth by linking directly to the UCMP's additional resources.