# Digit Span Evaluation: Summary

You have now completed the module on evaluating digit span and recency research. The most important ideas about this are:

In order to draw firm conclusions about the functioning of memory, Psychologists need to conduct their experiments with representative samples.
- However, the samples used in the research you have looked at consisted mainly of undergraduate students, who are not representative of the general population.
- Therefore, the research you have examined lacks sampling validity, and the results may not apply to all people.

End of module

## What next

- Take a test to see how much you have learned

## Navigation

Basic level content | Start | Digit span measures of STM | Recency measures of STM | Test your learning
Intermediate level content |  | Research using digit span measures | Research using recency measures |
Advanced level content |  | Ecological validity and STM research | Sampling validity and STM research |