Divide responsibility and nobody is responsible.
Without theory we can only copy.
Everyone is a customer for somebody, or a supplier to somebody.
The problem is that most courses teach what is wrong.
Eighty-five percent of the reasons for failure are deficiencies in the systems and process rather than the employee. The role of management is to change the process rather than badgering individuals to do better.
Management's job is to know which systems are stable and which are not.