Record the decisions made during the process of system design.
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Record the arguments for and against any major decision, and the factors
influencing the final choice.
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Record CRC cards for the major components.
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Maintain a log or diary of the process schedule.
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Important to produce this while the ideas are fresh, not in hindsight when
many details will have been forgotten.
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Note the code only records the outcome of decisions, not factors that
lead up to decisions being made.