User research sample size

“For usability studies aim for around fifteen users to get enough data points (30 is ideal)” – suggested by Rubin, Chisnell & Jared Spool. More participants often lead to better data. Including more people who are representative of your target users is always a good idea.

1. What is a user sample size?
2. How many people do you need for user research?
3. Is 40 participants a good sample size?
4. Is 30 respondents enough for a survey?

What is a user sample size?

The sample size is a term used in market research for defining the number of subjects included in a sample size. By sample size, we understand a group of subjects that are selected from the general population and is considered a representative of the real population for that specific study.

How many people do you need for user research?

Generally speaking, you'll want to conduct a minimum of 5-6 user interviews to identify and validate key user needs and design requirements.

Is 40 participants a good sample size?

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

Is 30 respondents enough for a survey?

Academia tells us that 30 seems to be an ideal sample size for the most comprehensive view of an issue, but studies with as few as 10 participants can yield fruitful and applicable results (recruiting excellence is even more important here!).