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Mission critical refers to any factor of a system (equipment, process, procedure, software, etc.) that is essential to the business operation or the organization. Failure or disruption of mission critical will result in the serious impact on business operations or organization, and even can cause social turmoil and catastrophes. Therefore, it is extremely critical to the organization's "mission." == Mission Critical System == Mission critical system — a system whose failure may result in the failure of some goal-directed activity. Mission critical system is just a longer term of a mission critical. Mission essential equipment and mission critical application are also known as mission critical system. Mission critical system is usually is the online banking system, railway and aircraft operating and control system, electric power systems, and many other computer systems that will affect the business and society seriously if downed. A good example of a mission critical system is a navigational system for a spacecraft The difference between mission critical and business critical is in the global activity and possibility of whole personal life black out.〔(【引用サイトリンク】url=http://www.activestate.com/blog/2010/03/mission-critical-vs-business-critical-applications-huh )〕 A business-critical system fault can influence only to a single company or bunch of them and can partly stop lifetime activity (hours or days). There are three different types of critical systems: mission critical system, business critical system, and safety critical system. All three terms are very similar. The difference between the safety critical system and mission critical system is that safety critical system is more of a system that, if failed, may result in serious environmental damage, injury, or loss of life, while mission critical system may result in failure in goal-directed activity. The example of safety critical system is a chemical manufacturing plant control system. The mission critical system and business critical system are similar terms, but a business critical system fault can influence only to a single company or an organization and can partly stop lifetime activity (hours or days). So it also can be used as a mission critical system in the business. Failure of it will cause very high cost loss for the business. All these three systems usually are generalized as mission critical. As a rule in crisis management, if a triage-type decision is made in which certain components must be eliminated or delayed, e.g. because of resource or personnel constraints, the mission critical ones must not be among them. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「mission critical」の詳細全文を読む スポンサード リンク
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