Surveys on TRM implementation are conducted every three years or so to study the evolution of TRM Implementation over the years. The responses gathered from the 2017 survey indicate that around 70% of the ANSPs surveyed have implemented TRM, while it is expected that around 44% of the ANSPs who have not yet implemented TRM are planning to do so in the near future. In most cases, participants indicated that they found TRM as effective with some ANSPs reporting that TRM is seen as highly effective.