In Progression, an element of work in a workflow is called a Work Item. The Work Item is a Binder object that contains one or more documents that are needed to complete the work cycle for a Process.
For example in the Human Resources Application New Hire Process, the work item is the collection of an Employment Application, Interview Notes, transcripts and other documents needed (in a Binder) to complete the New Hire Process decision to hire or reject the employment application.