This book collects some written exercises and solutions from the classworks of the course "Workgroup and Workflow Systems" at the Como campus of the Politecnico di Milano, Milano, Italy. Throughout the book, two approaches will be presented to describe business processes: the first approach is based on the UML (Unified Modelling Language) notation (including use case diagrams, class diagrams, activity diagrams) and on the BPMN (Business Process Modelling Notation) notation; the second approach is based on the WIDE (Worfklow on Intelligent Distributed database Environments) methodology, derived from the EU-funded project WIDE.