is the process of putting objects or events together on the basis of a logical rationale. There are two kinds of categorizing, grouping and classifying. When scientists group objects, they put them together on the basis of a single property. Leaves might be grouped by type of venation, size, shape, and so on. Grouping is useful in revealing similarities and differences that otherwise might go unnoticed. Classifying involves putting items together on the basis of more than a single property at a time. For example, leaves with net venation and red color might be grouped together on these two characteristics while leaves with net venation and green color would be placed in a separate group. Scientists in all fields use the categorizing process to group and classify objects they work with.

The act of placing strengths and weakness into categories in generic internal assessment.