Offloading - the concept of taking a software service and re-allocating it to a hardware implementation on a parallel processing unit in order to free the main CPU of loading - e.g. a network interface card may perform functions basic to TCP/IP such as checksums in order to offload those operations from the host CPU.
On-line Admission - when a system can run a feasibility test while currently providing other services in order to determine whether new services can safely be added to the current safe set.
On-Off Control - the use of relays to turn on and off motors to control a mechanical device.
Optical Navigation - using computer vision images of a scene to determine ranges to targets and to plan paths to navigate to a target using only video data.
Optimal Policy - a fixed priority assignment policy which will successfully schedule any set of services which can be scheduled by any other fixed priority policy.