 Okay, so that brings me to the end of my final point. I have talked about features of intelligent buildings using the study by Clamacum as an illustration. I then moved on to discuss the advantages of intelligent buildings and use the study by Chen and Lam and 201-0 to demonstrate the lower running costs and the research by Lam and Pristin in 2005 to show the better environment that can be created. So now it's time to hand you over to Caleb who will discuss the drawbacks. Caleb? Yes, thanks Paulie. So I'm Caleb and I'm going to talk about three disadvantages of intelligent buildings. First, the high construction costs and then the need for careful management. And third, the technical problems that might occur. After that, I will look at the issue of intelligent buildings in Hong Kong before finishing with short conclusion. Finally, we will have the Q&A session when you will be free to ask questions. Okay, so turning to my first drawback of intelligent using. The high construction costs, I think here. The study by Morrison and Roberts is most useful. They compare the cost of building a conventional office building with intelligent office into North America and to European cities. As you can see from the bar chart.