Combs et al. (2013) conducted a study to determine test-retest reliability and responsiveness of short-distance walking speed tests for persons with Parkinson disease (PD). Discriminant and convergent validity of walking speed tests were also examined. Eighty-eight participants with PD (mean age, 66 years) with mild to moderate severity (stages 1-4 on the Hoehn and Yahr Scale) were tested on medications. Measures of activity included the comfortable and fast 10-m walk tests (CWT, FWT), 6-min walk test (6MWT), mini balance evaluations systems test (mini-BEST Test), fear of falling (FoF), and the Activity-Specific Balance Confidence Scale (ABC). The mobility subsection of the PD quality of life-39 (PDQ39-M) served as a participation-based measure (Combs et al., 2013). Results indicated test-retest reliability was high for both walking speed measures (CWT, ICC(2,1) = 0.98; FWT, ICC(2,1) = 0.99) (Combs et al., 2013). Minimal detectable change (MDC(95)) for the CWT and FWT was 0.09 m/s and 0.13 m/s respectively (Combs et al., 2013). Participants at Hoehn & Yahr levels 3/4 demonstrated significantly slower walking speed with the CWT and FWT than participants at Hoehn & Yahr levels 1 and 2 (P < .01). The CWT and FWT were both significantly (P ≤ .002) correlated with all activity and participation-based measures (Combs et al., 2013). In conclusion, short-distance walking speed tests are clinically useful measures for persons with PD (Combs et al., 2013). The CWT and FWT are highly reliable and responsive to change in persons with PD (Combs et al., 2013). Short distance walking speed can be used to discriminate differences in gait function between persons with mild and moderate PD severity (Combs et al., 2013). The CWT and FWT had moderate to strong associations with other activity and participation based measures demonstrating convergent validity (Combs et al., 2013).