I see that there are a lot of methods for (product) sizing. I use product sizing mostly for estimating purpose (new projects and new releases for application maintenance puposes). The estimated product size is mostly between 300 FP and 5.000 FP with a lot of uncertainity.
The product size estimate is mostly used for estimates of effort / team size), duration and defects.
The project estimates are mostly based on business requirements, so also the product size is also estimated as a probability (with a range).
My question would be:
Is there also a model / method for evaluating to select the most relevant method for product sizing at the start of a project / release, knowing that an accuracy of +/- 10% is acceptable.