Classification Systems – Lesson Summary

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Learning Objective

In this lesson we will learn about classification systems for living and non-living things.

Learning Outcomes

By the end of this lesson you will be able to:

  • Give reasons for classifying things.
  • Define ‘taxonomy’.
  • Discuss how to choose criteria for classification systems.
  • Describe how classification keys work, with examples.
  • Discuss the limitations of classification systems.

classification systems lesson contents

(Images: blende12, Pixabay)

Lesson Topics

1 | Classification

2 | Scientific Classification

3 | How to Classify Things

4 | Problems With Classification

5 | Classification Keys

6 | Summary

Lesson Summary

  • Classification refers to the arrangement of things into different groups based on certain characteristics, and giving these groups labels.
  • Taxonomy is the scientific classification of living things.
  • Classification organises things in a way that makes it easier to identify, describe, remember, understand, communicate and predict information about them.
  • Classification systems require meaningful criteria for distinguishing between different things so that those that are most similar are grouped together.
  • Classification systems can change over time and there can be different classification systems for the same group of things.
  • A classification key involves a series of questions about the characteristics of something so that it can be correctly identified.
  • A dichotomous key has two possible answers for each question, with the answers leading to further questions and ultimately the identification of the unknown thing.
  • Dichotomous keys are usually represented as flow charts, but can also be represented as tabular keys or circular keys.

 
cartoon baby animals

How could you distinguish between these animals?

(Image: Elegant Solution, Adobe Stock)

(Header image: blende12, Pixabay)