needs a process to systematically validate through direct observation both historical estimates of task durations and estimates by subject matter experts.

Recommendation 4-4: The FAA should ensure that the ongoing data collection and input essential for model use do not place an unacceptable burden on data providers.

Recommendation 4-5: The FAA should ensure that output reports from the system predict consequences such as overall NAS availability time, deferred preventive maintenance activities, and overtime required.

Recommendation 4-6: The FAA should ensure that output reports are tailored closely to the needs of FAA’s internal users at multiple organizational levels, in order to increase transparency of, and user trust in, the model.

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