Institutions drift from their founding mission through accumulation of activities that each seem related to the mission and together represent its abandonment.
How Drift Occurs
Mission drift is the gradual displacement of an institution's founding purpose by activities, priorities, and constituencies that were not part of the original mission but that have accumulated through the individual decisions that each appeared to be mission-aligned at the time they were made. No single decision represents a departure from the mission; the aggregate of decisions represents an institution that is doing fundamentally different things than it was created to do.
The mechanism is consistent: the institution encounters an opportunity or pressure that is adjacent to its mission — close enough to be argued as mission-aligned, attractive enough to be worth pursuing. The first such expansion is small and genuinely adjacent. The second is adjacent to the first expansion, which is already adjacent to the founding mission. Each subsequent expansion is adjacent to the most recent one, which means the institution can drift significantly from its founding purpose while each individual step appears justified by continuity with the previous one.
The Constituency Capture Version
The most consequential form of mission drift is constituency capture: the gradual displacement of the institution's founding constituency by a new constituency whose interests are better served by the institution's current activities than by its founding purpose. The institution that was created to serve one population finds that its expanded activities serve a different population better, and the new constituency becomes more politically active in the institution's governance than the founding one. Over time, the institution's decision-making becomes more responsive to the new constituency's interests than to the founding constituency's, and the founding mission becomes a legacy description of what the institution claims to be rather than a description of what it actually does.
Mission drift is not the institution failing to do what it set out to do. It is the institution succeeding at doing things that were never what it set out to do, while continuing to describe itself in the founding mission's terms. The gap between the description and the reality is the drift — and it is measured in the distance between who the institution was built to serve and who it actually serves.
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