This document focuses on patching, which is one aspect of mission critical operations. The term 'patch' is usually associated with code repair, although this definition is not comprehensive. Patches may also be used to enable new hardware, supply new functionality, or deliver utilities. This paper, however, will confine the discussion of patches to defect fixes. In this context, patching falls into the area of ongoing operations and maintenance. Because of this, it is often overlooked or given low priority. Major design efforts and capital expenditures are usually concentrated at the beginning of the project life cycle, during systems design and procurement. Once the systems are installed, it maybe difficult to find additional resources for operations and maintenance activities. Unfortunately, it can take a catastrophic event to drive home the necessity and benefits of proactive support.
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