Some of the researchers present here, like myself, are concerned with people and the built environment while others are more concerned with the green environment. You may say that this distinction is unnecessary and that we are all addressing environmental problems. But I believe that there is an important difference which needs to be emphasised as a key issue of this conference. I would therefore first like to stress the issue of change in both approaches. I believe it is a relevant question to ask the conference whether change is treated differently in research concerning the built versus the green environment. In fact, I would like to question whether the issue of change is treated at all.