θ13: phenomenology, present status and prospect

Abstract
The leptonic mixing angle theta(13) is currently a high-priority topic in the field of neutrino physics, with five experiments under way, searching for neutrino oscillations induced by this angle. We review the phenomenology of theta(13) and discuss the information from the present global oscillation data. A description of the upcoming reactor and accelerator experiments searching for a non-zero value of theta(13) is given, and we evaluate the sensitivity reach within the next few years.