Siebel Business Process Framework: Task UI Guide > Task UI Concepts > Language Concepts for Task UI >
A task is a logical unit of work performed by an end user to complete a business operation. This logical unit of work might be completed using different mechanisms, one of which is Task UI.
In the context of the Task UI framework, this work is performed through a series of user interface views that guide the user towards completion of the task.
Throughout this guide and in other related documentation, the term task can refer either to a task definition or task instance.