The Lesson
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First, we defined the problem to be addressed.
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Needs
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Needs were derived from stakeholders. Data used to generate specific requirements was found in previous studies by NASA and other research groups.
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Needs were developed by splitting needs by stakeholder and envisioning what these stakeholders needed
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Functional analysis
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This is hard to do without a more narrowed solution to the problem. It serves a more a thought experiment.
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How to do this before system is fully designed?
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How do we define the functions of the life support system, if we don’t have a design selected?
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QFD
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For a complex system, many requirements are intertwined and relate to others strongly.
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Coming up with a metric to judge the importance of various requirements helps justify design.
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Thresholds and targets were approximated due to large possibility of parameters for different systems.
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Concept Selection
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Treating each subsystem as independent of each other may leave out key system interactions that we need to consider.
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But how do we find out about these systems interactions besides research and our own experience/engineering judgement?
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