Fatigue impact scaleThe FIS62 was developed in 1994 in a group of patients with multiple sclerosis (MS). Rather than measuring the level of fatigue itself, the instrument reflects a patient’s perception of the functionallimitation due to fatigue experienced within the previous month.The tool is composed of 40 items grouped into 3 scales: cognitive,physical and psychosocial functioning. All items are scored on a 0-4scale ranging from “no problem” to “extreme problem”.