The emerging school of thought called “postphenomenology” offers a distinct understanding of the ways that people experience technology usage. This perspective combines insights from the philosophical tradition of phenomenology with commitments to the anti-essentialism and nonfoundationalism of American pragmatism. One of postphenomenology’s central positions is that technologies always remain “multistable,” i.e., subject to different uses and meanings. But I suggest that as this perspective matures, philosophical problems are emerging around the notion of multistability, what I call “the problem of invariance” (...) and “the problem of grounding.” These problems point out things that remain unclear within the postphenomenological framework, such as how it handles structural claims regarding a technology’s various stabilities, and how it grounds its claims. How can postphenomenology make structural claims about technology and yet remain anti-essentializing? And on what epistemological basis does it ground its claims about human-technology relations? The paper concludes with a series of prescriptions that, if followed, enable postphenomenology to make edifying claims about technology, all while avoiding the problems of invariance and grounding, and maintaining its commitments to anti-essentialism and nonfoundationalism. (shrink)