 Dobranje, sveča, v tvoj prezentacij, včasno imamo koralizacije, vzvečanje in rečenju, vsega vsega vsega vsega, in vsega vsega vsega vsega vsega vsega. Vsega vsega vsega in rečenju vsega vsega vsega vsega vsega vsega. Vsega vsega vsega vsega vsega. Standard inspecije vsega, tako či precega vsega, precega, da ježite sumo monks in čehljična vsega ukljona vsega. Pekuhne, rečenje, takočne informacije, for efficient and effective performance of arch bridges. They can be grouped as structural, environmental and economic ones. And then the third step would be to define types of structural performances that are important for arch bridges. Assessment of arch bridges consists of revealing corrosion progress, defining, assessing its serviceability, traffic capacity, seismic performance due to wind load, and finding out the remaining durability of the bridge. Between each step we can, in fact, find the link to the objectives of the working group 2. Between the step 1 and the step 2, we have to define which monitoring method is to be used to measure certain quantity in order to define a performance indicator, and their uncertainties in measure data and in collecting data may appear. I will give you the example of reinforced concrete arch bridges. We have four bridges of the first generation, Shibanik Bridge, built in 1966. Then we have Park Bridge, built in 1968. But in 1999 it was repaired when the superstructure, the old pre-stressed concrete superstructure, was completely dismantled and replaced with a steel structure. And then we have two kirk bridges. At that time, to achieve such exceptional spans, very small concrete covers were used for those bridges. So it is, in fact, other maintenance from the very beginning. Then we have a second generation, Maslenitsa and Skladin bridges, other bridges for our new highway, and the new one set in a bridge for the state road. So here I will give you some details of some standard inspections techniques that were performed on those bridges. Some geometrical surveying, visual inspections, loading tests, some non-destructive or destructive and semi-destructive techniques. What we need to do here is to collect experience from previous inspections and establish regular inspection and include any other necessary technique. Bridges of the second generation are equipped with sensors. And in fact, for all three of them, we can measure displacements, corrosion, progress, humidity, also strain and temperature. Additionally, for Maslenitsa bridge, we can measure wind direction and speed. And at the old kirk bridge, at the two piers of a smaller arch, fiber optical sensors were installed during the repair to measure strain and temperature. What we need here is, in fact, to revive this monitoring system, because unfortunately, due to the limited budget, is not active. Here you can see details from our arch bridges, some details from the old ones, and let's say from the bridges of the second generation example of sensors at Skladin bridge, and complete overview of repairs, investigations, inspections, assessment and monitoring is presented in the paper. Now we go to the step, between the step two and the step three, while capturing all the indicators that affect certain structural performance, here uncertainties in combining those appropriate indicators may appear and should be treated appropriately. I will emphasize here that the interaction between those structural, environmental and economic parameters is definitely necessary. And I will give the example of seismic performance of reinforced concrete arch bridges. This is a table showing the data collection on structural indicators, geometry, details, materials, but of course they are influenced with environmental parameters, because, for example, the changes of the cross-section dimensions or the effective reinforcement in a certain cross-section will be influenced with, for example, combined wind and sea salt action and deterioration processes accordingly. And the economic parameter is hidden, in fact, in those knowledge level, because high knowledge level for a bridge of critical importance will require more extensive inspection works and of course comprehensive bridge monitoring. As we are always limited with the budget, it is of great importance to establish the most significant locations at the arch bridge to be inspected. This is an example of the most important cross-sections for seismic performance, the abatement, the crown, one-fourth of the arch span and the extremities of column are the most important. And at the end, instead of conclusions, I will give a flow chart of the activity plan for arch bridges, but in fact, it can be applied to any kind of structure. After collecting experience from previous inspections, we have to categorize monitoring methods, performance indicators, structural performance types, then the uncertainties need to be appropriately treated within a theoretical framework of the cost action and to reach the final goal to quantify the link between the monitoring types and structural performances. Thank you very much for your attention.