![]() In the movie, the characters realize that the failure of certain banks and other interconnected entities in the financial system would have catastrophic effects on the world economy and society as a whole. With many business systems, the assumption is that the failure can be tolerated for a "short time" and that it is cheaper to pay the customer or regulator compensation if an SLA is breached rather than factor in the cost to prevent it in the first place.Īlthough that approach is very common when people talk about business systems as being somehow less important than real-time systems, I am reminded of the following scene from the movie Too Big to Fail: We tolerate failures and unreliability in business systems that we'd never allow in an air-traffic-control system or hospital system. This difference in approach is fundamental in how the different systems are built and tested. When the discussion turns to financial systems, the term "business systems" is often used to distinguish such systems from "mission critical systems," the thesis is that if a mission critical system fails, lives are lost, and if a business system fails, it is not as important. During the past year, we've all been working from home and relying on platforms such as Amazon, DoorDash, so perhaps in the future, we'll consider those to be mission critical as well! What About Financial Systems? However, in software development, when we talk about mission critical systems, we often think about systems that are either real-time (such as flight-control and process control systems) or are used in industries where failure can mean the difference between life and death (e.g., patient health records, clinical systems, etc.), however, in reality, the definition is much broader in nature. When a mission critical system fails or is interrupted, business operations are significantly impacted. The textbook definition of a mission critical system is as follows:Ī mission critical system is a system that is essential to the survival of a business or organization. ![]()
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