Nussbaumer: That is a question of scale. If one compares architecture with computers or with other sophisticated systems such as airplanes, then the amount of technology in architecture is still very modest. In this regard we are still very much at the beginning.

Humm: A word about the flexibility of buildings and facilities. Today this is a sustainability crite-rion and an instrument used to reduce subsequent costs in the case of a change in use.

Nussbaumer: In long-term thinking there is already an architecture, a structural system, which consistently differentiates between primary, secondary and tertiary structures, thus facilitating subsequent changes. This flexibility is particularly pronounced in our Swisstower project, in which different uses played a role from the very first stroke of the pen, into which stories were "thought in" as it were.

Humm: What does this mean concretely when it comes to the primary structure and configura-tion of service facilities?

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