Computer system consists of two major components. 1. Hardware 2. Software Hardware is the name given to physical machines whereas software is the set of logical instructions that direct the hardware to achieve a particular task. Both the components are dependent on each other. One is useless in the absence of other. Vendors usually design the Hardware and conceptually it fairly matches with the Hardware of other vendors. on the other hand software designs, most of the …showed first 75 words of 4784 total…

…showed last 75 words of 4784 total…that may readily be changed ;because all state and representation information is held within the object itself. No access and hence no deliberate or accidental use of this information by other objects is possible. Changes to the representation may be made without reference to other system object. - Object may be distributed and may execute either sequentially or in parallel. Decisions on parallelism need not be taken to an early stage of the design process.