A dozen application-specific lists, and more detailed information online, help you sort through controller choices no matter what type of system you're building or upgrading.
A proportional-integral-derivative (PID) controller operating in a feedback loop can be very effective at driving a measured process variable towards a desired setpoint, but only if the controller is adjusted or tuned to accommodate the behavior of the controlled process.
A renewable-energy power plant has a chance to improve its technology after an electrical explosion wipes out much of the control network infrastructure.