Now that you bring up Jack, let me suggest you all subscribe to The Embedded Muse at www.ganssle.com (free). The latest has, in addition to the serious stuff, a very nice tidbit:
Thought for the Week
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The first 90% of the code accounts for the first 90% of the development
time. The remaining 10% of the code accounts for the other 90% of the
development time.

Erik