One difficulty with this project at least in the United States is that the boundaries that currently define relations of professional design and use are realized through institutionalized arrangements that are organized systematically to reproduce them. In those cases where boundary crossings occur, moreover, we discover that crossing boundaries involves encountering difference, entering onto territory in which one is unfamiliar and, to some significant extent therefore, unqualified. For those who’ve spent a lifetime building up competence within a domain of specialized professional practice, deliberately placing oneself on unknown ground is a difficult thing to do.