This work focuses on how digital infrastructures of a complex interorganizational system becomes visible and changes. While scientific research on infrastructures have addressed both theoretical and methodological issues, the way in which an inter-organizational and complex infrastructure is shaped and "cultivated" remains unexplored. The aim of this paper is to describe the most significant elements that characterize the interplay between human decisions and behaviors, infrastructure innovation and its visibility. These have been used as requirements to create a decision support system that could help experts to take decisions on an infrastructure for a planned change. In the paper, a longitudinal analysis is proposed with a focus on changes planned and implemented in the Air Traffic Management (a complex inter-organizational system adopted in all the European countries).