For the purpose of the operating system ，there are 4 aspects ：effectiveness , convenience , scalability and openness .

1. Effectiveness means improving system resource utilization and system throughput .


2. Convenience means to make computer easier to be used as a tool .


3. Scalability refers to the adaption to the requirements of computer hardware, network, architecture and application development .


4. Openness means to comply with world standards and specifications, especially the international standard of Open Systems Interconnection (OSI) .

The function of the operating system mainly contains 3 aspects.

1. OS serves as the interface between users and the computer hardware system .


2. OS acts as the manager of computer system resources .


3. OS implements the abstraction of computer system .