Exposure to a stimulus influences behavior in subsequent, possibly unrelated tasks. This is called priming; priming effects abound in usability and web design.| Nielsen Norman Group
Open-ended questions result in deeper insights. Closed questions provide clarification and detail, but no unexpected insights.| Nielsen Norman Group
What users believe they know about a user interface impacts how they use it. Mismatched mental models are common, especially with designs that try something new.| Nielsen Norman Group