Contextual inquiry is a type of ethnographic field study that involves in-depth observation and interviews of small samples of users to gain a deep understanding of work practices and behaviors. Typically, it is conducted during the early discovery stages for a new feature or product. Key definitions:

• Context: The research takes place in the users’ natural environment as they conduct their activities the way they normally would. The context could be in their home, office, or somewhere else entirely
• Inquiry: The researcher watches the user as she performs her task and asks for information to understand how and why users do what they do

Contextual inquiry is useful for many domains, but especially well suited for considering users’ interactions with complex systems and in-depth processes as well as the point of view of expert users.