Steve Portigal is the founder of Portigal Consulting, a customer research company based in California. Their research has informed the development of mobile devices, medical information systems, music gear, wine packaging, financial services, corporate intranets, videoconferencing systems, and iPod accessories. His book Interviewing Users distills down his experience and is simply an essential read for anybody in design research who is likely to conduct interviews – which is pretty much everybody. Steve has recently put together a page of links where you can read excerpts, reviews and interviews with him. In short – this book is essential for the module.