Triangulation is used in engineering surveying.A geographical area is divided into triangles from which the surveyor is able to map points within that region by using three fixed points and horizontal angular distances to locate fixed points of interest (e.g., property line referencepoints). Since any point can be located with two lines, the third line represents an extra perspective and check. We will not use trigonometry to arrive at our cost estimates, but we can utilize the concept of triangulation.We should approach our economic estimate from differen tperspectives because such varied perspectives add richness, confidence, and quality to the estimate. Triangulation in cost estimating might involve using different sources of data or using different quantitativemodels to arrive at the value being estimated.

As decisionmakers we should always seek out varied perspectives.


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