Anatomy of explanations

In Tilly’s view, we rely on four general categories of reasons. The first is what he calls conventions—conventionally accepted explanations. Tilly would call “Don’t be a tattletale” a convention. The second is stories, and what distinguishes a story (“I was playing with my truck, and then Geoffrey came in . . .”) is a very specific account of cause and effect. Tilly cites the sociologist Francesca Polletta’s interviews with people who were active in the civil-rights sit-ins of the nineteen-sixties. Polletta repeatedly heard stories that stressed the spontaneity of the protests, leaving out the role of civil-rights organizations, teachers, and churches. That’s what stories do. As Tilly writes, they circumscribe time and space, limit the number of actors and actions, situate all causes “in the consciousness of the actors,” and elevate the personal over the institutional.

Then there are codes, which are high-level conventions, formulas that invoke sometimes recondite procedural rules and categories. If a loan officer turns you down for a mortgage, the reason he gives has to do with your inability to conform to a prescribed standard of creditworthiness. Finally, there are technical accounts: stories informed by specialized knowledge and authority. An academic history of civil-rights sit-ins wouldn’t leave out the role of institutions, and it probably wouldn’t focus on a few actors and actions; it would aim at giving patient and expert attention to every sort of nuance and detail.