Contextual inquiry is a structured field interviewing process that involves both conversation and observation. Contextual inquiries requires a high degree of skill from the usability specialist, in order to ask appropriate questions without interrupting the participants' workflow or influencing their responses. Sometimes two usability specialists are used for a contextual inquiry project, one to conduct the interview, and one to observe and record participant behavior. Contextual inquiry can help discover unmet needs and understand existing behaviours in greater depth.