The determinants of recycling in multi-family residences were investig
ated by administering a 50-item questionnaire to 230 residents of buil
dings where recycling collection systems had been installed. The level
of tenant participation, defined by a composite index of self-reporte
d usage, was positively associated with income, education, recycling m
otivation, and cleanliness of the recycling system. It was negatively
associated with the number of different types of collection containers
. At the aggregate level. participation varied considerably between th
e complexes. These differences were largely accounted for in terms of
three system support variables, specified in terms of the ''user frien
dliness'' of the recycling system, its spatial location within the com
plex, and the degree to which the manager supported the program. Multi
ple regression analysis indicated that user friendliness and manager c
ommitment together accounted for 85.3% of the variance in the aggregat
e participation index. These results suggested several experimental in
terventions designed to increase participation in multi-family recycli
ng programs.