This workshop addresses the opportunities and challenges generated by complex digital objects - objects created using innovative technologies - and current strategies for preserving them. The workshop will present a definition of complex digital objects with examples and an overview of the preservation challenges they pose, such as deciding what to collect and problem- solving for software and hardware dependencies. Using case studies, participants will identify and analyze a set of challenges to preserving actual works that UK cultural heritage institutions are looking to acquire. This will be done through small group exercises and will draw on approaches based on work carried out by Tate, the UK Legal Deposit Libraries (LDLs), and the Digital Preservation Coalition (DPC).