When routine inspection results, like examples given in the previous chapter, show indications which could point in the direction of AAR, it is a wise decision to bring in the specialists. As these specialists are normally brought in when something odd has been observed, the first step to be taken is to establish what the cause of the “strange” results is. At this point AAR is still only one of the options, and therefore, other alternative causes of damage should also be considered, see Figure 14. To eliminate or confirm the presence of AAR, some simple tests can be performed. This part is described in the current chapter. Depending on the severity of the damage and the likelihood of the damage being caused by AAR, a judgment call can be made to confirm AAR and investigate the severity of the AAR damage in parallel. In this report the severity investigation is described in Chapter 5, while the confirmation methods and tests are described in the current chapter.