In IT every person plays two roles – Provider and Consumer. For example application administrator provide users’ access to the application. At the same time, he consumes services provided by DBAs, system, network and storage administrators. And so on… It’s a chain.
Value flow illustrates dependencies between Consumers and Providers in the chain of service delivery process. It defines what job has to be done on each chain link, reveal qualitative and quantitative metrics for sub-services’ success and describe incoming services.