[T]here is a tendency to fall back on what is easiest to measure and to count, i.e. outputs, even if they are less important than outcomes. The danger of this, however, is to negate the major purpose of results-based reform, which is to refocus efforts on what citizens and society ultimately gain from government.
From OECD article http://www.oecd.org/dataoecd/4/10/2497163.pdf paragraph 25.
