Use
Within SAP Business Workflow you use tasks for the following purposes:
You use a
task group to collect tasks used in a common context.Prerequisites
To create a single-step task, you must know the
object type and its method to be executed with the task.To create a multistep task, you must be familiar with the business process you wish to map as a workflow definition, its flow and its individual steps.
Features
You can process tasks of the following types.

Only cross-client single-step tasks (= standard tasks) and cross-client multistep tasks (= workflow templates) can be created now.
When a workflow task/customer task is copied, the task type is changed automatically to workflow template/standard task.
For further information, refer to
Creating and Maintaining Tasks. Also refer to the relevant task type: