There are many reasons to invest in measurement.A favorite truism: you measure what you value and you value what your measure.
…Our experience at the Hewlett Foundation is that this usually takes us pretty far, but that sometimes we must make do with qualitative indicators of progress that fall far short of ultimate outcomes. Statistical analysis can provide a reasonable picture of the success of a de-worming program in Africa. But broad-scale social movements require long time horizons and patience with setbacks and periods of stasis.