What's recommended for the number of users to use in qualitative and quantitative testing?

1. What is a good number of participants for a qualitative study?
2. How many participants are needed for a quantitative study?
3. What is the best sample size for qualitative research?
4. Why you should test with 5 users?

What is a good number of participants for a qualitative study?

While some experts in qualitative research avoid the topic of “how many” interviews “are enough,” there is indeed variability in what is suggested as a minimum. An extremely large number of articles, book chapters, and books recommend guidance and suggest anywhere from 5 to 50 participants as adequate.

How many participants are needed for a quantitative study?

Summary: 40 participants is an appropriate number for most quantitative studies, but there are cases where you can recruit fewer users.

What is the best sample size for qualitative research?

Others state that qualitative sample sizes of 20-30 are typically (pp. 56) conducted by researchers to establish data saturation using a grounded theory approach to qualitative inquiry (Creswell, 1998).

Why you should test with 5 users?

In a research study from 2000, Jakob Nielsen and Tom Landauer found that you only need 5 users to test your application in order to identify 75-99% of all usability problems. You only need 3 to 5 users to identify the majority of usability issues.