expert to work, and an answer is immediate. Should be the first estimating method in most cases—more elaborate methods can be used if the information value justifies it. Lens Model Used when there are a large number of repeated estimates of the same type (e.g., assessment of investments in a big portfolio) and when the same type of data can be gathered on each. Once created, the Lens Model generates instant answers for this class of problems regardless of the availability of the original expert(s). The model can be created using only hypothetical scenarios. Rasch Model Used to standardize
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