[Requirements for reliability of the system should be specified here. Some suggestions follow:Availability — specify the percentage of time available (xx. xx%), hours of use, the maintenance access, degraded mode operations, and so on.Mean Time Between Failures (MTBF) — this is usually specified in hours, but it could also be specified in terms of days, months or years.Mean Time To Repair (MTTR) — how long is the system allowed to be out of operation after it has failed?Accuracy — specifies precision (resolution) and accuracy (by some known standard) that is required in the system's output.Maximum Bugs or Defect Rate — usually expressed in terms of bugs per thousand lines of code (KLOC/bugs) or bugs per function-point (bugs/function-point).Bugs or Defect Rate — categorized in terms of minor, significant, and critical bugs: the requirement (s) must define what is meant by a "critical" bug; for example, the complete loss of data or a complete inability to use certain parts of the system's functionality.]
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