Between-Subjects vs. Within-Subjects Study Design

Summary: In user research, between-groups designs reduce learning effects; repeated-measures designs require fewer participants and minimize the random noise.

When you want to compare several user interfaces in a single study, there are two ways of planning your study:

(Note that here we use the word “design” to refer to the design of the study , and not to website design. The design of the study is also called experimental design .)