Any design issue may be reframed "up" or "down" -- the dialectic
choice.
The "up" option amounts to either redefining the issue with greater
abstraction, or to extending the issue over other similar design
questions into a larger one.
The "down" option amounts to dividing the current issue to fairly
independent parts. The division must be such that each part can be
resolved with little or no consideration of what happens with the
other parts.
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