This is still part of one and the same journey to the back stairs. Having gone through the front door, our group has now crossed the flat. The next transcript [image_3] locates us at the back door of the flat. Let us remember that the concierges work to open the door of the flat is observed by his work colleague, and filmed with a video camera. After having tried the first key on the ring in the main lock, as the key does not turn, he removes it from the lock, checks all the keys on the ring and selects another key. The transcript is organised along key trying work (turning a key in the lock is indicated with a black bar) and key selecting work (scrutinising of keys for subsequent attempts are indicated with a white bar).

Concierges in Red Road are very cautious and careful about the keys they have at hand. They are aware that these keys do not always give them unproblematic and immediate access to the buildings or parts of it. For concierges these are not housing management or design problems, but practical problems, which they resolve in an ad hoc, contingent manner. For them the building form of the high-rise is not just a mass-produced repetitive technology that they face during their work. The technology of 213/183/153 Petershill Drive, including its separation into three blocks, with lifts, floors and flat numbers, and front and back doors, are resources that concierges engage with and use to accomplish work tasks.