Participants of this short course will learn the basics about an open-source 3-D structural geological modeling software, which allows the implicit (i.e. automatic) creation of complex geological models from interface and orientation data. This approach also offers support for stochastic modeling to address parameter and model uncertainties and provides a basis for open scientific research using geological models, with the aim to foster reproducible research in the field of geomodeling. This short course is dedicated to rather experienced participants of the STC 2019 in Aachen (master students, PhD students, professionals) - seats are limited (duration ca. 3 hours).For retirees the same price is applicable as for students.For a successful registration and payment, both need to be completed in one run!