Findings published in Multiple Sclerosis and Related Disorders show that a smartphone application accurately measures tapping speed in MS. To determine the correlation between tapping speed and disability scales, Juan Luis Chico-Garcia, MD, and colleagues assessed the reliability of smartphone tapping speed. The study included 103 patients (median age, 47). MS subtypes included relapsing-remitting MS (RRMS; 77.7%), secondary-progressive MS (SPMS; 17.5%), and primary progressive MS (PPMS; 4.9%). The intraclass correlation co – efficient during the first week was 0.714. Both the median and maximum keys per sec – ond showed a negative correlation with the Expanded Disability Status Scale, the 9-Hole Peg Test, and the Timed 25-Foot Walk Test and a pos – itive correlation with the Processing Speed Test raw score and Z-score. Median and maximum keys per second were lower in SPMS compared with RRMS and suggested that measures of tapping speed were associated with MS subtype independent of age. According to Dr. Chico-Garcia and colleagues, the measures obtained with this application are reliable, with some variability between days.