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Scalability is

[t]he ability to use the same applications and systems on all classes of computers from personal computers to supercomputers and for those applications to continue to function well as it (or its context) is changed.[1]


Scalability is

the ability to satisfy given requirements as systems, networks, and systems of systems expand in functionality, capacity, complexity, and scope of trustworthiness requirements security, reliability, survivability, and improved real-time performance. Scalability must typically be addressed from the outset; experience shows that scalability usually cannot be retrofitted into systems for which it was not an original design goal.[2]


Scalability is

[t]he degree to which video and image formats can be sized in systematic proportions for distribution over communications channels of varying capacities.[3]


  1. California Office of Systems Integration, Definitions (full-text). See also Peerless Wall & Window Coverings, Inc. v. Synchronics, Inc., 85 F.Supp.2d 519, 530 (W.D. Pa. 2000) (full-text) (scalability in relation to software or a computer system is "its ability to accommodate growth. . . .").
  2. A Roadmap for Cybersecurity Research, at 1.
  3. ATIS Telecom Glossary 2011.

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