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The three types of computer system organization;

  1. Single instruction, single data (SISD) stream: A single processor executes a single instruction stream to operate on data stored in a single memory. 
  2. Single instruction, multiple data (SIMD) stream: A single machine instruction controls the simultaneous execution of a number of processing elements on a lockstep basis. Each processing element has an associated data memory, so that each instruction is executed on a different set of data by the different processors. 
  3. Multiple instruction, multiple data (MIMD) stream: A set of processors simultaneously execute different instruction sequences on different data sets.

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