False consensus bias

False consensus bias assumes that everyone thinks the same way you do. For example, if you're an Italian and love soccer, you might assume that all Italians love soccer and that those with different opinions are outliers. UX researchers can be influenced by this bias when believing that most users will agree with their idea or design. It is a dangerous bias that might result in huge expenses and wasted time.

You can reduce the risks of false consensus bias by exploring your users' needs, pain points, and preferences. In the early stages of product development, you should also define and validate your assumptions with real or potential users. It can prevent your team from building a product no one actually needs.