In computing

Computing

Computing is usually defined as the activity of using and improving computer hardware and software. It is the computer-specific part of information technology...

, SISD (single instruction, single data) is a term referring to a computer architecture in which a single processor, a uniprocessor, executes a single instruction stream, to operate on data stored in a single memory. This corresponds to the von Neumann architecture

Von Neumann architecture

The term Von Neumann architecture, aka the Von Neumann model, derives from a computer architecture proposal by the mathematician and early computer scientist John von Neumann and others, dated June 30, 1945, entitled First Draft of a Report on the EDVAC...

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SISD is one of the four main classifications as defined in Flynn's taxonomy

Flynn's Taxonomy

Flynn's taxonomy is a classification of computer architectures, proposed by Michael J. Flynn in 1966.-Classifications:The four classifications defined by Flynn are based upon the number of concurrent instruction and data streams available in the architecture:Single Instruction, Single Data stream...

. In this system classifications are based upon the number of concurrent instructions and data streams present in the computer architecture. According to Michael J. Flynn

Michael J. Flynn

Michael J. Flynn is an American professor emeritus at Stanford University. He co-founded Palyn Associates with Max Paley and is Chairman of Maxeler Technologies. He proposed Flynn's taxonomy in 1966....

, SISD can have concurrent processing characteristics. Instruction fetching and pipelined execution of instructions are common examples found in most modern SISD computers.