Goodhart’s Law: When the Metrics Become the Mission

by

Edward Addai

29 March 2026


What if the very indicator you use to prove your organisation’s impact is quietly undermining it? In the social sector, where accountability is paramount and resources are scarce, the pressure to “show results” is immense. Yet there is a paradox awaiting the unwary manager: the moment we fixate on a specific metric, it begins to lose its value as a measure of true success.

This is Goodhart’s Law. Formulated by economist Charles Goodhart, it posits that “when a measure becomes a target, it ceases to be a good measure” (Goodhart, 1984). In essence, the act of gaming a metric erodes its utility for understanding genuine performance.

When Numbers Lose Their Meaning

In developing countries, the consequences are stark. Consider the health sector in Uganda in the early 2000s, where NGOs were evaluated on the number of insecticide-treated bed nets distributed. While the target was met, the underlying goal of reducing malaria was compromised. In some cases, nets were distributed to households that already had them, or to areas with low transmission rates, simply to hit distribution quotas (Müller et al., 2008). The metric became the mission, decoupling the intervention from its intended outcome.

Similarly, in education, a focus on primary school enrollment rates across sub-Saharan Africa has, at times, led to a decline in learning outcomes. When government managers are rewarded solely for increasing enrollment, resources are diverted from teacher training and classroom quality to simply counting more bodies in seats (Andrews, 2013).

What the Law Teaches Us About Managing for Results

Goodhart’s Law forces a confrontation with a core fallacy of results-based management: the assumption that the indicator and the objective are the same. For social sector leaders, it reveals that managing for results often devolves into managing to the result, fostering what Muller (2018) describes as “metric fixation”, where the pursuit of the target overshadows the mission.

Acting on the Insight: From Fixation to Fidelity

How, then, do we act on this in practice? Social sector managers must:

·       Treat indicators as proxies, not the objective. This means investing in qualitative verification. If you are measuring “farmers trained,” supplement that with small scale, randomized checks on whether practices were actually adopted.

·       Diversify your dashboard. Relying on a single metric invites distortion. Pair output indicators (e.g., teachers trained) with outcome indicators (e.g., learning outcomes) and, crucially, “negative” indicators (e.g., school dropout rates) to capture unintended consequences.

·       Create psychological safety for candid data review. If your team fears punishment for missing a target, they will find a way to “achieve” it artificially. Shift the culture from a focus on proving success to improving performance. Use data to ask, “What is this metric incentivizing us to overlook?” rather than “Did we hit the number?”

In a world demanding accountability, the wise social sector leader knows that the map is not the territory. The ultimate result is not the one you count; it is the change in the people you are serving.

 

References

Andrews, M. (2013). The Limits of Institutional Reform in Development: Changing Rules for Realistic Solutions. Cambridge University Press.

Goodhart, C.A.E. (1984). Problems of Monetary Management: The UK Experience. In: Monetary Theory and Practice. Palgrave Macmillan.

Müller, O., Traoré, C., Becher, H., and Kouyaté, B. (2008). Malaria morbidity, treatment seeking behaviour, and mortality in a cohort of young children in rural Burkina Faso. Tropical Medicine & International Health, 13(5), pp. 649657.

Muller, J.Z. (2018). The Tyranny of Metrics. Princeton University Press.

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