# Digit Span: Studies and Evidence

You have now seen how we can measure the capacity of STM using digit span experiments. In this module you will learn about two important research studies that investigated STM capacity using span measures and chunking. The studies were carried out by:

- Miller (1957)
- Simon (1974)

As you learn about these studies, you will also be able to practise your skills of data interpretation and drawing conclusions from psychological research.