• Chemical classification
  Chemical classification
  Chemical classification systems attempt to classify as elements or compounds according to certain chemical functional or structural properties. Whereas the structural properties are largely intrinsic, functional properties and the derived classifications depend to a certain degree on the type of...
  
  
• Taxonomy
  Taxonomy
  Taxonomy is the science of identifying and naming species, and arranging them into a classification. The field of taxonomy, sometimes referred to as "biological taxonomy", revolves around the description and use of taxonomic units, known as taxa...
  
  , the practice and science of categorization
• Mathematical classification
  Class (set theory)
  In set theory and its applications throughout mathematics, a class is a collection of sets which can be unambiguously defined by a property that all its members share. The precise definition of "class" depends on foundational context...
  
  , construction of subsets into a set

Biology

• Biological classification
  Biological classification
  Biological classification, or scientific classification in biology, is a method to group and categorize organisms by biological type, such as genus or species. Biological classification is part of scientific taxonomy....
  
  
• Alpha taxonomy
  Alpha taxonomy
  Alpha taxonomy is the discipline concerned with finding, describing and naming species of living or fossil organisms. This field is supported by institutions holding collections of these organisms, with relevant data, carefully curated: such institutes include natural history museums, herbaria and...
  
  , the science of finding, describing and naming organisms
• Linnaean taxonomy
  Linnaean taxonomy
  Linnaean taxonomy can mean either of two related concepts:# the particular form of biological classification set up by Carl Linnaeus, as set forth in his Systema Naturæ and subsequent works...
  
  , the classic scientific classification system
• Cladistics
  Cladistics
  Cladistics is a method of classifying species of organisms into groups called clades, which consist of an ancestor organism and all its descendants . For example, birds, dinosaurs, crocodiles, and all descendants of their most recent common ancestor form a clade...
  
  , a newer way of classifying organisms, based solely on phylogeny
• Virus classification
  Virus classification
  Virus classification is the process of naming viruses and placing them into a taxonomic system. Similar to the classification systems used for cellular organisms, virus classification is the subject of ongoing debate and proposals. This is mainly due to the pseudo-living nature of viruses, which...
  
  , naming and placing viruses

See also

• Categorization
  Categorization
  Categorization is the process in which ideas and objects are recognized, differentiated and understood. Categorization implies that objects are grouped into categories, usually for some specific purpose. Ideally, a category illuminates a relationship between the subjects and objects of knowledge...
  
  , general
• Classification of the sciences (Peirce)
  Classification of the sciences (Peirce)
  The philosopher Charles Sanders Peirce did considerable work over a period of years on the classification of sciences . His classifications are of interest both as a map for navigating his philosophy and as an accomplished polymath's survey of research in his time...
  
  
• Systematic name
  Systematic name
  A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection...