Most systems will be brought on line incrementally. The preference will be to “fail safe” i.e. terminate a mission rather than court a safety risk. As the system, including its operators, move up the experience curve, however, it will be possible – and likely essential – to modify the operating criteria – maintaining or improving safety whilst achieving higher performance and functionality.
In addition, many sub-systems will go obsolete during the extended life of a major system: planning for and managing replacements, without compromising system integrity is important.
And, of course, the many stakeholders will be able to contribute to a Learning from Experience process, either reducing the cost of operations for the same level of performance or adding additional functionality.