This web page is designed to help you understand the concepts of scaling and magnitude estimation.  The links below are listed sequentially, beginning with some background information on psychophysics.  Simply click "Next" at the bottom of each page to advance to the next topic, or click directly on your desired topic from the list below.

1. What is psychophysics?

2. How do we look at the relationship between stimulus and perception?

3. What is scaling?

4. There are two types of scaling that can be performed, indirect and direct. 

5. What is magnitude estimation?

6. How can you be sure subjects understand magnitude estimations?

7. What is cross-modality matching?

8. What does data from a magnitude estimation experiment tell you?

9. Does anyone really use scaling in the real world?

10. Scaling - An Ergonomic Assessment Tool

11. Scaling - A Medical Assessment Tool

12. References