that the concept of workflow is deeply integrated in may business. For example, CRM needs a lots of people got involved. They are csr, client, manager, technical service people, supplier and so on. They do have to interact with the system in different time to produce some results. The basic idea is that many business workflow needs a lots of people to be involved in. No matter how a application try to make this daily bussiness activity managed by a application system, it needs some sort of workflow engine implicity or explicity.