There are many, many ways to estimate a software project, ranging from formal models that can only be worked by a University professor through to a salesperson's hopeful guess.
Here we present a simple, proven software project estimation method that produces reasonably accurate results and has been used estimate substantial fixed price work.
This method is based on a quick but robust initial design on the premise that later versions of the design will reduce the amount of work as developers come up with smart ideas for saving work.
This method also calls for participation by a substantial number of people, increasing buy-in and gaining accuracy. It also follows the principles of the Cardboard Checklist for Planning, where relevant.
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