There are various types of color systems that classify color and analyse their effects. Different sources may classify the same species differently. Different states may also classify vehicles differently. There are many different ways to classify neurotransmitters. However, different groups and different scholars may classify a hadith differently. I don't want to classify myself. There are several ways to classify climates into similar regimes. For other criteria that classify criticisms, see . Many border varieties have a mixture of features that make them difficult to classify. There are many ways to classify research designs. There are many ways to classify services. There is little consistency as to how different organizations classify it. Aristotle is considered to be the first person to classify organisms. They therefore classify it as its own subfamily within Passeridae. There are several ways to classify endocarditis.