Download the MSQLI: A User’s Manual (PDF) https://www.nationalmssociety.org/F...Measures/Modified-Fatigue-Impact-Scale-(MFIS) Fatigue Impact Scale (Fisk et al, 1994b) https://academic.oup.com/cid/article-abstract/18/Supplement_1/S79/317047 another paper that is cited as showing that this scale can differentiate between CFS patients and MS patients...yet it says "This study compared 145 patients referred for investigation of chronic fatigue (ChF)". http://sci-hub.tw/https://doi.org/10.1093/clinids/18.Supplement_1.S79 see also article in Occupational Medicine https://academic.oup.com/occmed/article/66/3/256/2750552