This document discusses online ethnography and trace ethnography. Online ethnography allows researchers to study technologically-mediated human interactions and communications through digital traces like log files, emails, and documents. Trace ethnography combines participant observation with analysis of trace data from sociotechnical systems to understand user patterns and practices. Traces provide a wealth of data about coordination and knowledge work beyond direct observations. The document also discusses how sociotechnical practices are inferred from observations and tests which then undergo calculations and are represented in discourse and texts that shape policy.