The tutorial targets ontology designers, e … The tutorial targets ontology designers, engineers, and practitioners (including generic skilled web users). The tutorial provides a method named extreme Design, based on good practices i.e., ontology design patterns, for the development of ontologies. We illustrate theoretical aspects of ontology design patterns, and analyse some relevant samples taken from a catalogue of ontology design patterns. The tutorial includes hands-on sessions with ontology design activities, performed by using the available state of art platforms. sing the available state of art platforms.