This article considers how Schwartz's norm-activation model has been a
pplied in the context of individual contributions to public goods, and
how it might be extended to better reflect the full gamut of behavior
al determinants in such situations. A review of literature in politica
l economy, psychology, and sociology suggests that the translation of
Schwartz's model from situations of isolated individual helping to the
public goods context requires the role of organizations, policy initi
atives, and notions of justice to be more explicitly incorporated with
in the model. Existing elements of the model also need to be broadened
to encompass some of the unique characteristics of public good contri
butions, such as shared (as opposed to diffused) responsibility, and l
ower levels of individual decisiveness. A qualitative environmental ca
se study illustrates some of the required extensions.