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| url = http://simula.no/research/engineering/publications/Jorgensen.2007.1 }}</ref>. The top level categories are the following:
* Expert estimation: The quantification step, i.e., the step where the estimate is produced
* Formal estimation model: The quantification step is based on mechanical processes, e.g., the use of a formula derived from historical data.
* Combination-based estimation: The quantification step is based on a judgmental or mechanical combination of estimates from different sources.
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