A 36-year-old male with treatment-resistant major depressive disorder and comorbid social anxiety disorder is requesting documentation to support a workplace disability accommodation. He reports he can no longer attend in-person team meetings, meet project deadlines, or manage his previous workload. His PHQ-9 score is 19 and his employer has requested a functional capacity evaluation from his psychiatric provider. The PMHNP is conducting a functional assessment. Which approach MOST accurately captures psychiatric functional impairment for the purpose of disability evaluation?