Single-blind experimental design is used where the experimenters either must know the full facts or where the experimenter will not introduce further bias. However, there is a risk that subjects are influenced by interaction with the researchers – known as the experimenter's bias.

When would you use a single blind study?

Single-blind studies are typically conducted when the participants' knowledge of their group membership or the identity of the materials they are assessing might bias the results.

What is a single blind procedure used for?

A type of clinical trial in which only the researcher doing the study knows which treatment or intervention the participant is receiving until the trial is over. A single-blind study makes results of the study less likely to be biased.