OBJECTIVES: Computerized games challenge players to move quickly and accurately, but result in game-specific scores rather than objective data. Newly developed AccuTrak software with Wii technology can challenge players to move a cursor to an on-screen target using hands or feet, but also record data that might help document coordination deficits in people with disabilities. Our purpose was to examine the reliability and validity of this method. METHODS: Thirty-six healthy adults and nine people with multiple sclerosis (MS) used a Wii device to move a cursor and click on the center of a target appearing on a computer screen. AccuTrak software provided feedback after each set of 6 trials regarding a) the time from target appearance to click, and b) distance from the target center. Each hand performed 30 trials; each foot performed 36 trials. Time and distance data were compared left-right and hand-foot, and to self-reported movement accuracy from the Movement Ability Measure as analyzed using item response theory methods.  RESULTS: Intraclass correlation coefficients (ICCs) time and distance data were 0.66 and 0.90, respectively, between dominant and non-dominant hands; between hand and foot performances ICCs were 0.70 and 0.94. The correlation between objective data and logit estimates of self-reported ability to move accurately was -0.53 for time and 0.21 for distance. The time-distance relationship fit a power trendline with R2 equal to 0.80 for healthy volunteers; volunteers with MS did not fit the same trendline. CONCLUSIONS: Reliability was better for distance data; concurrent validity with self-report was better with time data. Construct validity was supported in the observance of Fitts’ Law with speed-accuracy trade-off in healthy volunteers; people with MS tended to have increased error even with longer times. The methodology shows promise for use when investigating coordination deficits such as those in people with multiple sclerosis.