Sorting students by skill level.

Classification of blood based on antigens.

(countable) The method in which individuals are grouped together into families that live together.

System that organizes data automatically.

The principles of grouping (or Gestalt laws of grouping) are a set of principles in psychology, first proposed by Gestalt psychologists to account for the observation that humans naturally perceive objects as organized patterns and objects, a principle known as Prägnanz.

a system of classification that classifies catalase-negative Gram-positive cocci based on the carbohydrate composition of bacterial antigens found on their cell walls.