||The Comprehensive Executive Function Inventory (CEFI) is a rating scale designed to measure behaviours that are associated with Executive Function (EF) evaluation (strengths and weaknesses) in youth aged 5 to 18 years. The CEFI is composed of items related to attention, emotion regulation, flexibility, inhibitory control, initiation, organization, planning, self-monitoring, and working memory. With 100 items on a likert-type scale -90 are distributed among the CEFI scales and 10 on the Positive and Negative impression scales – the CEFI offers parent, teacher, and self-report (12 to 18 years) forms, allowing for a multi-rater perspective of a youth’s executive function. This information can ultimately be used to guide assessment, diagnosis, and treatment planning. The CEFI is also useful in a variety of research contexts and can be used as an effective tool to evaluate the success of an intervention program.