® It is dependent on the knowledge of cost drivers and/or the amount of time spent in each phase. ® Experience-based estimation may be flawed because of obsolescence of the historical data used or because the estimators' memory of past projects is flawed. ® All the levels are dependent on the size estimate-the accuracy of the size drives the accuracy of effort, development time, staffing, and productivity estimates. ® It ignores the software development environment. ® It oversimplifies the impact of security issues. ® It ignores customer attributes-skill, cooperation, knowledge, and responsiveness. ® It ignores documentation and other requirements. ® It ignores requirements volatility (but an organization may add this as an extra adjustment factor in computing EAF).
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