This special issue looks for articles that address the question of the passage through higher education from the concept of complex trajectory (focused on delay, stop-out or change of modality, degree or institution), preferably following a longitudinal methodology, or focusing on how technology helps to monitor, control and support students in these processes, and that take equity issues into consideration. In short, we want to produce an issue that address the question of understanding complex trajectories and how higher education institutions approach them. We consider a trajectory to be complex when, beyond the diversity of curricular itineraries, it follows a different path and pace from that stipulated by the institution. In this way, among other possible routes, there are trajectories of delay, stop-out and change. The change can be of degree, of discipline, of higher education institution, or, particularly relevant to this issue, of modality (i.e., from face-to-face to hybrid or online education, or vice versa).