The OPERATING system must be able to keep track of the various ACTIVE processes.

The operating system must allocate and de-allocate various resources for each active process.

The operating system must protect the data and physical resources of each process against unintended interference by other processes. This involves TECHNIQUES that relate to MEMORY, files, and I/O devices.

The results of a process must be independent of the speed at which the execution is carried out relative to the speed of other concurrent process.

The operating system must be able to keep track of the various active processes.

The operating system must allocate and de-allocate various resources for each active process.

The operating system must protect the data and physical resources of each process against unintended interference by other processes. This involves techniques that relate to memory, files, and I/O devices.

The results of a process must be independent of the speed at which the execution is carried out relative to the speed of other concurrent process.