from Part III - Practical Tips
Published online by Cambridge University Press: 22 November 2025
Many projects fail to achieve their expected goals, partly because their goals were unrealistic to start with. The objective of this chapter is to enhance knowledge of the reasons why managers set unrealistic project goals. First, we identify key biases in the project management literature that might motivate a manager to set unrealistic project goals. We then analyze seven case studies of well-known project failures to determine which of these biases contributed the most to unrealistic goal setting. Our findings indicate that of these biases, two cognitive biases (optimism bias and overconfidence bias), the planning fallacy and escalation of commitment had the highest impact on these projects. We conclude by proposing ten practical recommendations managers can use to set more realistic project goals in future. These recommendations cover the following key areas: Effective goal setting, effective goal appraisal and effective project appraisal.
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