I spoke about within-green and between-green variability in putting green speed using the standard deviation of multiple measurements as a statistic. The median standard deviation for both within- and between-green variation is about 0.3 feet. That's approximately 4 inches. I suggest that greenkeepers continue to report a single number as the green speed. I also suggest that greenkeepers occasionally take multiple measures of green speed, on the same green and on multiple greens, and then calculate the standard deviation. If the standard deviation is more than 4 inches, and if resources are available to do the work, I suggest doing some maintenance that may reduce the variation. That could include measuring the #ClipVol of putting surfaces, verticutting, topdressing, rolling, applying a growth regulator, adjusting mowing height, etc. The measurement can be made again to evaluate the results of the changed maintenance practices.