Once the potential areas of entrapment have been identified and the potential number of victims sized up, search operations should commence in an orderly manner, beginning with verbally calling out for victims to identify their location if possible, and searching using a systematic search pattern. Possible search patterns include triangulation (using three searchers approaching a potential area of entrapment from three different directions), a right/left search pattern (one team searches the left side and one team the right side of a building), or a bottom-up/top-down search pattern. Searchers should stop frequently to listen for noises or attempted communication from victims; often this can involve all searchers stopping activity at specified periods of time to listen.