Before revision: A sample system context diagram using Hatley–Pirbhai modeling Hatley–Pirbhai modeling is a system modeling technique based on the input– processing –output model (IPO model), which extends the IPO model by adding user interface processing and maintenance and self-testing processing.
After revision: A sample system context diagram using Hatley–Pirbhai modeling Hatley–Pirbhai modeling is a system modeling technique based on the input– process –output model (IPO model), which extends the IPO model by adding user interface processing and maintenance and self-testing processing.