Week 9: Week 9 — Classification and Division

1. Classification sorts multiple items into categories based on shared characteristics. Division breaks a single complex subject into its component parts. Classification groups many into fewer; division breaks one into many.
2. The basis of division is the single organizing principle used to sort items. Using one consistent basis is required — mixing bases creates categories that overlap or miss items.
3. A classification thesis announces the subject, the categories, and the basis for division. Example: 'Three approaches to exam preparation — passive review, retrieval practice, and interleaved practice — differ in the cognitive demand each places on long-term memory.'
4. Criteria are the standards used to assign items to categories. Clear, defensible criteria make the classification persuasive, not arbitrary.
5. A taxonomy is a hierarchical classification system where broader categories contain narrower subcategories. Biological taxonomy (kingdom, phylum, class, order, family, genus, species) is the most familiar example.
6. Partition is the division of one specific entity into its own parts (chapters of a single novel; components of a single machine). Classification groups many entities by shared traits.
7. Enumeration lists items in a series. It is the structural backbone of most classification paragraphs: 'The first type … The second type … The third type …'
8. Transitions in classification mark category shifts: 'Unlike the previous group …' 'The second category differs from the first in that …'

Ask at home: What does the way you categorize something reveal about what you think matters most?

En español: ¿Qué revela sobre lo que más te importa la manera en que clasificas algo?