Abstract
Over the years, estimators have been challenged to predict the costs of jobs to which they could relate by similar experience. To the estimator this is a comfortable situation. Now, with increasing frequency, the estimator must deal with new elements and new environments for which there are little or no historical data. In these instances the estimator must rely on his experience and judgment to develop his cost estimates. Estimating for a changing technology is no different from established estimating practices except that more care is required in data preparation. Each item of a new requirement must be broken into elements which can be compared with similar elements for which there is an experience record.
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