All wells drilled require a pre-drill prediction of pore fluid and fracture pressures that defines the ‘drilling window’. This course explains the objectives, methods and uncertainties of prediction, based on extensive global experience. The necessary understanding of the geological/geophysical context of abnormal pressures leading to standard algorithms will be provided. Part of the challenge is terminology and contrasting display methods of geoscience and operations/drilling groups. Both approaches are necessary and investigated in interactive exercises, which will form an essential component of the course.