Studies of Latin American civil society tend to assume that popular organiz
ations promote "high-intensity" forms of political participation while poli
tical parties mainly encourage voting. This study compares the influence of
these two forces in the urban informal sector. Association involvement, lo
w in both samples, is related to "higher-intensity" participation, but the
differential influence of associations and parties holds only for Costa Ric
a; Nicaragua's revolutionary FSLN has fostered a more politically active ci
tizenry.