wonders about the reasons people give for their and others' conduct. He notes that reasons are offered in familiar forms which are not inserted randomly in the slots of social life. To study the social production of reasons, he creates a two dimensional grid by crossing a distinction between popular and specialized reasons with a distinction between formulas and cause/effect explanations. The resulting table contrasts conventions (popular formulas), stories (folk causal explanations), codes (specialists' formulas), and technical accounts of cause/effect relationships that we would expect to see in a PhD dissertation or professional science publication. Through illustrations and commentaries, Professor Tilly produces a short, story-rich book that offers a systematic set of propositions about social patterns related to each type of reason, an effective pedagogy for the college professor, and a neatly framed image of the public intellectual.The appeal of the book hinges on the reader's reaction to the social ontology presumed by the fourfold table. Consider "Oops, I'm such a klutz!" as a way of responding after accidentally spilling coffee on someone (p. 16). Drawn from popular culture, Tilly understands the phrase as a convention that resolves an embarrassing moment without bothering to offer a causal explanation. We are told that what the spiller might offer, were he to offer a cause/effect narrative, would be something like: the spiller, preoccupied by job anxieties and not yet adjusted to the new corporeal habits required by a deteriorating musculature, was inattentive after a bad night's sleep.If we keep our appreciation of such events limited to a content analysis of verbal expressions, Professor Tilly's characterizations at first glance seem to work. At second glance, the content analysis becomes problematic. "I'm a klutz" is not necessarily just a formulaic reason: it may be an abbreviated cause/effect explanation, and one that a technical investigation might prove true. We might find that the subject often has such accidents even after good nights' sleep, and has had them regularly since he was a healthy, blissfully unemployed lad. Having developed a personal vulnerability to distractions that was already manifest in early