This chapter gives an assessment of the most popular and relevant control techniques for hybrid propulsion systems. Generally confined to the traction system 'outer loop', the techniques to be described determine how torque is regulated and speed controlled. Because of the presence of multiple torque sources in the hybrid drivetrain it is necessary to employ torque control of all the sources, including engine, hybrid M/G(s), and any other source of motive power (flywheels). Sensorless control is gaining more acceptance, especially for brushless dc and induction machines. This chapter looks at some promising sensorless control techniques and gives an assessment of where this technology is going. Fault management, diagnostics and prognostics are important aspects of hybrid powertrain development. How are faults sensed, what the consequences of a faulted driveline component, particularly the electric M/G are, and how fault recovery is managed are topics that face the hybrid propulsion control system designer. Hybrid propulsion system M/G control is nearly universally implemented with field orientation techniques, regardless of the electric machine type. It is the main focus of this chapter to present field oriented control principles in an uncomplicated manner with the essential principle of field oriented control as the enabler for any electric machine to deliver the same performance and response as if it were a dc armature controlled machine.