We investigate the use of Contextual Design, and in particular the process of Contextual Inquiry, for designing complex and innovative systems. Contextual Inquiry is an emerging practice used for investigating behavioural requirements of users in their work environment. The advantage of Contextual Design over other requirements elicitation methodologies, such as Requirements Engineering and User Task Analysis, is the focus on observation and in-work interviews for extracting requirements and designing customer-centred systems. Based on that, we have applied and adapted this methodology to the special case of gathering user requirements for a mobile exhibition system. The major part of this paper discusses the experience and results of this research with the purpose of providing background knowledge and guidelines to future implementors of Contextual Inquiry.