Computer architecture and organization.
Computer Architecture and Organisation is internal working, structuring and implementation of a computer. computer Architecture system refers to the externally visual attributes of the system. Externally visual attributes, here in computer science, mean the way a system is visible to the logic of programs . Organisation of computer system is the way of practical implementation which results in realization of architectural specifications of a computer system.[1] In more general language, Architecture of computer system can be considered as a catalog of tools available for any operator using the system, while Organisation will be the way the system is structured so that all those cataloged tools can be used, and that in an efficient trends.