## 8 Conclusions  
The paper focused on the value of information (VoI) analysis for measurements of chloride content, performed before the occurrence of reinforcement depassivation. The VoI analysis was performed based on a decision theoretical framework built as part of very recent advances in the COST Action TU1402 on \"Quantifying the Value of Structural Heath Monitoring\" using the pre-posterior method of analysis. The pre-posterior analysis was applied taking into account different types of exposure situations and material properties. As a part of the analysis, a decision tree was formed, based on which all the possible outcomes of the process were obtained, accompanied with the associated probabilities and costs. From these investigations, the following conclusions were apparent:  
Figure 4: Minimum cost of reactive repair, \(C_{\text{rep},\text{min}}\), for different probabilities of damage once the depassivation occurred, \(P\) (\(D_{\text{cruck}}\mid D_{\text{dcp}}\)), given the cost of measurement, \(C_{\text{meas}}=1\), and the probability of depassivation, \(P_{\text{dcp}}=0.6\). Figure 3: Minimum cost of reactive repair, \(C_{\text{rep},\text{min}}\), for different probabilities of correct measurements, \(P\) (\(D_{\text{no-dcp}}\mid T_{\text{no}}\)) and \(P\) (\(D_{\text{dcp}}\mid T_{\text{sys}}\)), given the cost of measurement, \(C_{\text{meas}}=1\), and the probability of depassivation, \(P_{\text{dcp}}=0.6\). * With the increase of the initial probability of depassivation, \(P_{dep}\), the maximum cost of measurement, \(C_{meas,max}\), which is still cost effective, increases;
* When observing the unit cost of measurement, \(C_{meas}=1\), the minimum cost of reactive repair, \(C_{rep,r,min}\), which is still cost effective, slightly decreases with the increase in the probabilities of correct measurement, \(P\) (\(D_{no-dep}\mid T_{no}\)) and \(P\) (\(D_{dep}\mid T_{yes}\)); and
* The same conclusion can be made when observing the increase in the probability of damage once depassivation occurred, \(P\) (\(D_{cruck}\mid D_{dep}\)), with a rate of decrease being more pronounced. To broaden the analysis and to overcome some of the limiting presumptions employed in the paper, further actions should be taken:  
* The paper focused on presenting the general procedure of obtaining the Vol for chloride content measurements and the outcome was presented as a ratio of the costs; however, to obtain the Vol of a certain structure or structural element, the real costs of repair and measurements have to be known and analyzed. Furthermore, several measurement and repair strategies and methods should be reviewed and compared in the analysis;
* The analysis should be broadened to include indirect costs related to the unavailability of the structure due to the repair activities, i.e., additional travel times and distances, together with associated environmental and social impacts;
* The analysis was performed taking into account only one deterioration phenomenon; however, the analysis should be broadened to take into account all possible deterioration phenomena that can occur, considering the combined effect of certain phenomena;
* The analysis in the paper did not focus on the exact bridge, bridge element, or exact location on the bridge; rather, the used parameters represent the holistic situation of a general case. However, to perform the analysis, a particular bridge element should be considered, in which the properties related to chloride ingress are homogeneous. In this way, an exact initial probability of depassivation, \(P_{dep}\), could be determined;
* Since the accuracy of the measurement method plays an important role in calculating the measurement's cost-effectiveness, exact properties of the chosen measurement method should be known and considered. Furthermore, spatial variability should be reviewed and taken into account.