 So I'm talking about the sports hall. It's a new case study. The structure is right now being finished. It's within two months between going into service. And it's a two-part structure in reality, as large auditorium over there and a small additional hall over there. This one is covered by a rather standard key structure and this one is covered by a tent on supported suspension structure. So inside it looks like this. This is, again, the large hall, small hall, roof, or large hall over the small hall, total structure, and the rendering of the situation in the future. It's quite extensively monitored because of Polish law, which requires monitoring systems on all large structures where the consequences of failure are high. So there are accelerometers, which will measure accelerations. Horizontal displacements are measured in bearings, as well as vertical displacements in tendons. Also temperature strains. And again, temperature at the points where strains are measured. And also meteorological quantities are measured and saved. Vertical displacements are measured in 12 points and additional two control points with vibrating wire sensors because those wire sensors tend to yield the best results in the long term. The location of the sensors is indicated here. And the temperature is monitored in many points because most probably it was the least problematic way or it was the least problematic. Very able to be measured. So there are 61 points where temperature are measured and recorded. Those points are indicated here over the large hall and over the small one, as well. A small graph of the monitoring is, results of the monitoring are recorded every 15 minutes. So there's quite a lot of data being gathered. For all the monitoring stations. And now what we do intend to do with this information. How to evaluate the value of information. First, we've had yesterday quite extensive discussion on that. And the final conclusions were to either push the problem what would be the situation without the monitoring and with the monitoring and this way. That's some information on the value of information obtained with monitoring. Finally, after quite a long discussion, we decided to concentrate on one displacement and temperature sensor. And do the reliability analysis focused on the critical tendon in the main hall. Where the limits function with model uncertainty dealing with a snow load because the snow load is the most critical load in the structures of this type. And also take a look at the finite element method model resistance as affected by the tendon strength. With resistance model uncertainty with coefficient of variability of 20%. And we think that we may assume that the model uncertainty is similar for snow and temperature loads. There are two situations. There is no monitoring. And there's another second situation with the monitoring. So this way, using the monitoring, we can get a better evaluation of the risk. A better estimate of the risk in doing our structure. Thank you very much. And then this tendon would be reduced. Are you prepared or replaced? If necessary, that's the action, right? In case of 110, then if you limit your attention to 110. But in order to get an idea of this model uncertainty, you will look at one sensor measuring the deformation. Measure in the displacement, vertical displacement of the total displacement. But you need all the temperature sensors in the hall. Because you want to have the response of your hall to change in temperature distribution. I will have the temperature distribution over the whole hall because the temperature is recorded as well. Exactly. At every point, so there is no problem with that. So you focus on one... Yeah, just to state the sensor, limit all temperature. We may, as it's recorded, there is no problem with that. Yeah, good. Well, then we understand the situation. Thanks. Maybe I would like to clarify, we discussed a little bit during the diner yesterday. We should a little bit reformulate because on the resistance side, we have just a stress in the tender. So there is no uncertainty. But we have uncertainty in the computation of load effect. So given the snow load, so initially we considered this as the resistance model uncertainty, but it's load effect. I know, yeah. But this is the concept is the same. Yeah, the load effect of what's being done. And maybe add a little bit more to the risks. How are you having thought about how to calculate the consequences of failure? Well, I can bear with you better. This is a consequence of the specification of the failure consequence. In my opinion, it's not so easy to access the value of the failure consequence. Yes. So it's here, maybe we should compare the release. We should update the release or failure probability without the failure consequence. Okay, well, we want to compare costs with costs, costs on the site. But I think that there is also space for assumption. This is monumental, really. So failure consequences will be very important. Yeah, of course. But if this failure of this component leads to a collapse, we can start to rebuild the structure of the business. Then there may be persons. However, we can update only the failure probability. So this is a more easy approach. Of course. But you need to have the consequences. Who will have the consequences? Yeah, you need to make some assumptions for the cost model. So the most easy way before starting, you can have a normalized cost model. So we say the consequences of failure is maybe one. And then in relation to that, you have the costs for your monitoring system. But you need to have the relation. So this would be the simplest way, maybe as a starting point. And then it's the economic value of the stadium. So this goes basically to the investment costs. And the cost of only one sensor, not the core monitoring system in our analysis. Oh, yes. Yes and no. We assume that only one sensor is analyzing. One sensor is analyzing. All sensors are analyzing. So you quantify the costs which are going into your analysis. And then, yeah. So this is about the cost model. And then the economic consequences. But we have for sports hall, there's also the consequences in relation to human safety. That's a little more hard to quantify. Okay. We began with the problem of dealing with the consequences of closing the hole. Yes. In case of excessive snow load. Because in fact, that's the reason for the whole monitoring system structure. Because the snow load is the driving load. And then for the operator, that would be important to know whether they have to pay for removing the snow from the rooftop. Yes, as it is, or closing the hole together for a period of time. Okay. But then here we have the actions, which is cleaning the roof, or closing the sports hall. And this is the scenario you would like to support with your monitoring information. Well, that's the reason for the monitoring for snow load. Yeah. But that's fine. Then you have the cost of removing the snow. That's the standard right here. Yeah. I think it's a cost per square meter of the roof. Yeah. Yeah. Easy to estimate. Yeah. Yeah. Yeah. Okay. I think it's a very good case study. Very nice. Operating this winter, we'll see how much snow we will have. Yeah. Okay. Maybe we won't have snow at all. Yeah.