SIPOC is a six sigma tool. The acronym SIPOC stands for Suppliers, inputs, process, outputs, customers. A SIPOC is completed most easily by starting from the right ("Customers") and working towards the left.
For example:
A number of six sigma SIPOC references are available, including isixsigma.com [1] and opensourcesixsigma.com.[2]
SIPOC is a high level process map, used to obtain a description of the process at hand, as well as define the boundaries of the project.