How to Conduct User Observations
Observing users interacting with a product can be a great way to understand the usability of a product and to some extent the overall user experience. Conducting observations is relatively easy as it doesn’t require a huge amount of training and it can be relatively fast – depending on the sample size of users you intend to observe.
https://www.interaction-design.org/literature/article/how-to-conduct-user-observations