Poor scope definition leads to unrealistic budgets and unforeseen changes, which significantly contribute to cost overruns.
Other factors like change management and WBS definitions are secondary contributors compared to scope inadequacy.
PSP Study Guide References:
The guide emphasizes scope definition as a critical factor for accurate budgeting and planning.
Conclusion: The correct answer is D, as scope definition at the estimate stage has the most frequent and significant impact on cost overruns.
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