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One of them is the difficulty in being able to estimate design effort required in a design project, which impacts not only resource requirements and lead-time but also the final cost. This article presents the findings of a case study conducted for Pratt &amp; Whitney Canada, recognized as a global leader in the design and manufacturing of aircraft engines. The study models parametric cost estimation relationships to estimate the design effort of integrated blade-rotor low-pressure compressor fans. Several effort drivers are selected to model the relationship. Comparative analyses of three types of models are conducted. 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