29 September 2011 
  The ability of software to use an appropriate quantity of resource of certain type (e.g., the amount of main memory and the second level memory, the size of temporary files, etc.) during the work under prescribed conditions.

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The ability of software to use an appropriate quantity of resource of certain type (e.g., the amount of main memory and the second level memory, the size of temporary files, etc.) during the work under prescribed conditions.
