This study explored the promotion of recycling in multi-family dwellings. An exper imental design investigated four behavior change techniques: biweekly postcards giving specific feedback to each dwelling unit as to quantity and contamination of the recyclables, newsletters giving general information on recycling and the amount recycled by the city as a whole, written pledges committing households to recycle for a specified period, and volunteer coordinators who distributed informa tion and answered questions from residents. The effectiveness of these techniques was compared against that of a control group. The findings suggest that volunteer coordinators are not an effective intervention technique in multi-family dwellings, and that feedback and commitment techniques are useful mainly for managing contamination in medium sized complexes. The data also suggest that the size of a multi-family dwelling complex significantly affects the amount of recyclables col lected and the level of contamination. Smaller complexes with less than ten units recycled up to three times the amount on a per unit basis as complexes with more

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