Byrne provides a rigorous account of observation as an urban research method, distinguishing structured from naturalistic modes while insisting that observation is never equivalent to passive looking. The observer simultaneously records, interprets and analyses, making research design inseparable from epistemology. The chapter’s central contribution is procedural clarity: where to observe, what to observe, for how long, with which recording devices, and under what ethical conditions are treated as constitutive decisions rather than logistical details. Structured observation allows temporal and spatial comparison through protocols and audit sheets; naturalistic observation seeks to reveal tacit social rules and situated behaviour. Byrne also extends observation beyond vision through sound, smell and touch, while considering GIS, GPS, sensors, remote sensing and AI as emerging observational infrastructures. The chapter bridges classical urban sociology, behavioural mapping and contemporary data-rich urban analysis by showing that systematic observation can connect embodied field presence to reproducible spatial evidence without pretending that interpretation disappears.