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Sustainable Applications
The first phase for any application is the development cycle which provides its own set of challenges. The second phase and sometimes more daunting, could be the "Production Support" phase. Applications that spend more time on their backs than their feet are problematic and will be a burden until the day they are retired. This also may bring about early retirement in extreme cases.
When an application is being designed, sustainability should be built into an application so it robust enough to withstand any bangs and bumps within reason. Bullet proof in other words.