We describe the content and outcomes of the First Workshop on Open-Ended Evolution: Recent Progress and Future Milestones OEE1, held during the ECAL 2015 conference at the University of York, UK, in July 2015. We briefly summarize the content of the workshop's talks, and identify the main themes that emerged from the open discussions. Two important conclusions from the discussions are: 1 the idea of pluralism about OEE-it seems clear that there is more than one interesting and important kind of OEE; and 2 the importance of distinguishing observable behavioral hallmarks of systems undergoing OEE from hypothesized underlying mechanisms that explain why a system exhibits those hallmarks. We summarize the different hallmarks and mechanisms discussed during the workshop, and list the specific systems that were highlighted with respect to particular hallmarks and mechanisms. We conclude by identifying some of the most important open research questions about OEE that are apparent in light of the discussions. The York workshop provides a foundation for a follow-up OEE2 workshop taking place at the ALIFE XV conference in Cancun, Mexico, in July 2016. Additional materials from the York workshop, including talk abstracts, presentation slides, and videos of each talk, are available at  http://alife.org/ws/oee1 .
['Tim Taylor', 'Mark A. Bedau', 'Alastair Channon', 'David H. Ackley', 'Wolfgang Banzhaf', 'Guillaume Beslon', 'Emily Dolson', 'Tom Froese', 'Simon J. Hickinbotham', 'Takashi Ikegami', 'Barry McMullin', 'Norman H. Packard', 'Steen Rasmussen', 'Nathaniel Virgo', 'Eran Agmon', 'Edward Clark', 'Simon McGregor', 'Charles Ofria', 'Glen E. P. Ropella', 'Lee Spector', 'Kenneth O. Stanley', 'Adam Stanton', 'Christopher Timperley', 'Anya Vostinar', 'Michael Wiser']
Open-ended evolution: Perspectives from the oee workshop in york