Halfway through reading this I learned there was a much revised second edition released in 2007. The thirty year old original was so good at that point though I didn't even mind.
In this book Suchman outlines the inherent challenges of designing conversation like interactions between people and computers.
Specifically, she enters an argument regarding the nature and structure of human activity with respect to designing computer systems. One camp thinks human activity is driven by a kind of more or less fully formed "plan". Based on this, some computer system designers think they can create systems that guide human action by 1. identifying and codifying the ideal 'plan' of that action, 2. having the system identify when the user deviates from this plan 3. correcting the user. Suchman's argument is that much of human action is inescapably "situated" in that it is made of responses to the specific circumstances.The evidence she gives in support of her own view is the nature of human communication, which, it so happens, is also considered to be a (ideal?) model for man-machine interactions. Specifcally, she introduces a perspective from ethnomethodolgy that points out how our speach acts shape and create contexts within which further acts are understood—that is to say, the meaning of an utterance is tied to its context, and even the most simple contexts are multi-layered. For example, if a Mother asks her son "Did you hit Billy?", and Billy doesn't respond, the silence is taken to have significance by virtue of the preceeding question. Suchman provides more concrete support of her argument in the form of a study of office workers interacting with a copy-machine. In the study she notes various interaction 'breakdowns' that occur because of the inherent inability of the machine to understand various contexts.
One reviewer says the book is dense. I think the first half is fairly lucid, but that the sections covering the copy-machine study are not something you want to read before bed. The inescapable problem is that Suchman is describing, in very specific detail, sets of exchanges between a machine and a pair of users. This can get tedious. Ideally, we'd have the actual video recordings, but we don't, because book. However, the details describe lead to specific and thoughtful insights and support her larger argument.