What is used to control a process?

Inputs trigger or feed a process but do not control it - they are consumed by the process rather than directing its behavior.

Functions are organizational units consisting of teams and tools that carry out activities; they are not the internal control mechanism for a process.

Objectives define the expected outcomes and performance targets of a process, providing the criteria against which process behavior is measured and corrected. They act as the control mechanism by establishing what the process must accomplish, enabling management to assess whether the process is functioning correctly and to adjust it when deviations occur.

Stakeholders have an interest in or are affected by a process, but they are not the internal control mechanism that governs how the process executes.