Pro WF: Windows Workflow in .NET 3.5
Apress | 2008-06-23 | ISBN: 1430209755 | 856 pages | PDF | 11,5 Mb

Windows Workflow Foundation is a ground–breaking addition to the core of the .NET Framework that allows you to orchestrate human and system interactions as a series of workflows that can be easily mapped, analyzed, adjusted, and implemented.
As business problems become more complex, the need for a workflow–based solution has never been more evident. WF provides a simple and consistent way to model and implement complex problems. As a developer, you focus on developing the business logic for individual workflow tasks. The runtime handles the execution of those tasks after they have been composed into a workflow.