Comparison to Past Experience
Let’s apply the comparison approach to software development estimation.
What past work was similar to this work?
Is this yet another custom report for the business? Or a starter website for yet another small company? Sometimes our projects are amazingly similar to what we’ve done in the past.
Other times, they’re startlingly different. That’s not surprising. If we already had software to do what we wanted, we probably wouldn’t be starting a new project. It could be something that no one has ever done before, or, at least, no one that we know.
More often it’s somewhere in the middle, with both similarities and differences ...
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