Why is Classification Important?
Classifying things into different categories prevents new information from getting lost. We categorize by recognizing similarities and differences between things, and how they relate to one other. Classification is the basis for all concept formation.
3 Stages of Classification
Single Stage Classification- involves separating a set of objects into two or more subsets based on at least one observable property. For example, clouds are classified into three basic groups: cumulus, stratus, and cirrus clouds. Binary classification is a specific type of Single Stage classification. In this simple classification, objects are sorted into two groups based on whether or not they have a certain property.
Multistage Classification- sets are sorted into subsets, then each of those subsets is sorted again and again. This creates several layers, or stages, of subsets. Example: Animals that may have been grouped as vertebrates may be separated again into groups of reptiles, birds, mammals, fish, and amphibians. These are all subsets of vertebrates.
Serial Ordering- objects are placed in order by the extent to which they have a certain property. For example, rocks may be placed in order from smallest to largest or lightest to heaviest.
Multistage Classification- sets are sorted into subsets, then each of those subsets is sorted again and again. This creates several layers, or stages, of subsets. Example: Animals that may have been grouped as vertebrates may be separated again into groups of reptiles, birds, mammals, fish, and amphibians. These are all subsets of vertebrates.
Serial Ordering- objects are placed in order by the extent to which they have a certain property. For example, rocks may be placed in order from smallest to largest or lightest to heaviest.