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Afield study was conducted to investigate changes in the importance of project critical success factors across four stages in the project life cycle. A total of 408 project managers or project team members cur-rently involved in a project responded to the questionnaire. Ridge regression analysis was performed on the initially derived ten critical success factors, reducing the final number of critical success factors to eight. A stepwise regression was then done on the critical success factors at each of the four stages in the project life cycle. Results indi-cated that the relative importance of several of the criticalfactors change significantly based on life cycle stages.