Hennig argued that the best classification of organisms is one that exactly reflects the genealogical relationships among these organisms. The concept has been modified since by many others, including Warren H. Wagner of the University of Michigan. It provides evidence of phylogenetic relationship and is used to define taxa. For now, we will not hold you responsible for knowing them. However, if you wish further information, see the Judd et al. text.
Methodology Make evolutionary assumptions .
This includes selecting the taxa to be examined and determining whether they are monophyletic or not. Select characters of evolutionary interest . In practice, the number of characters much be one less than the number of taxa for all branches of the tree to be resolved. The characters used can be diverse, representing those obtained from both morphology and molecular studies. In phenetic approaches to classification, many more characters are used.