CONCEPT
Representational Transformations
The operation at the heart of distributed cognition — information moves through a system by being translated between media, each translation serving as both cognitive work and potential checkpoint.
In Hutchins's framework, cognitive work proceeds through chains of representational transformation. Representations are not abstract information states but physical objects in specific media — a bearing observed through a pelorus, a number called across the bridge, an entry in a logbook, a line drawn on a chart. Each medium has material properties that determine what cognitive operations can be performed on the representation, how reliably those operations proceed, and how the representation can be coordinated with others in the system. The transformations between media are not incidental to the computation — they are the computation. Each transformation requires cognitive work, introduces the possibility of error, and simultaneously creates a cognitive checkpoint at which the information can be examined in its new form and compared against expectations. A bearing that falls outside the expected range signals an observation error. A fix that places the ship in an implausible location signals a plotting error. The chain of transformations is also a chain of error-detection opportunities.
