A standardized tool based on respondents’ self-report and assessment, used to assess impairments in executive functions such as planning, problem solving, attention control, inhibition, and emotional regulation. It consists of items that focus on the daily difficulties faced by people with frontal lobe damage or dysfunction. DEX helps physicians assess the impact of executive deficits on daily life and develop rehabilitation strategies for patients with traumatic brain injury, stroke, or neurodegenerative diseases.