The Cross-enterprise Tumor Board Workflow Definition (XTB-WD) describes the different Tasks of a Tumor Board Review process, and the accompanying information in the form of input- and output documents that are linked to the different Tasks in the process. The XTB-WD describes a relatively small part of a larger workflow definition, in this case an oncological care pathway. Other parts of the oncological pathway can be defined in a later stage, in other Workflow Definitions. The different Workflow Definitions can be seen as ‘building blocks’ that describe the actual care pathway of an individual patient. 