Systems Engineering
System engineering can best be explained as coordinating multiple tasks within the two disciplines of engineering and engineering management. This paper highlights the systems method of coordinated tasks and its relevance concerning current and future business system life cycles: concept, design, planning, testing, optimization, and deployment. It defines the boundaries necessary for a robust life cycle and analysis to occur.
4. Requirements Types
4.7 Durability
Durability is how long a system can perform its intended function. It is typically measured in terms of service life. Service life of components, and of the system as a whole, is related to their maintenance. If not enough maintenance is performed, the life is reduced. Once the life of the item has been reached, it will need repair or replacement. Service life can be measured in terms of number of uses, operating hours, or calendar time. Durability is related to the economics concept of a Durable Good, one that yields utility over time rather than being consumed in one use. A passenger airplane has high durability, because it can operate for decades and tens of thousands of flights. The opposite of durability is consumption. The fuel used in the airplane is consumed (used only once), and is therefore not durable.