Accuracy and precision are different things

accuracy-precision

Accuracy is the absence of error; precision is the level of detail. Effective economic problem solving requires being accurate; but only being as precise as is helpful at any given stage of problem solving. In the pre-feasibility phase of a project, accurate but imprecise methods, rather than very exact methods will all consideration of all reasonable economic approaches. It will also minimise the tracking of needlessly detailed economic data.

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