The Patterns in Model Engineering (PAME) workshop5 was held on 21 July 2015 as part of the Software Technologies: Applications and Foundations (STAF) conference, in L'Aquila, Italy. The workshop focused on identification, analysis and presentation of patterns across all aspects of modelling and Model-Driven Engineering (MDE), including patterns for modelling, metamodelling, transformation, and in constraints. The workshop featured three invited presentations by Jordi Cabot (ICREA, Spain), Daniel Varro (BME, Hungary) and Antonio Cicchetti (MDH, Sweden), five full papers, and a significant discussion and debate about the roles that patterns can play in modelling. This paper summarises the workshop discussion and highlights some of the key research challenges in the field.