For a limited time only you can download the full text of Finding the Right Job for Your Product by Clayton M. Christensen et al. The article itself isn’t revolutionary — they essentially mirror the transition that marketing research has undergone in moving from demographic to affinity customer segmentation. Christensen and his colleagues describe that transition in terms of product development. It starts to get a little muddled as they come up with their own interpretation/strawman of user-centered design and then critique it, but the intentions seem noble.