The study aims at reducing the amount of generated waste of households in Santiago de Cuba by different intervention strategies. The effectiveness as well as the psychological effects of commitment and prompts were tested in a field study in 6 different research areas. The increased generation of household waste in most of the developing countries is a growing problem. Most of these countries have no treatment of waste except disposal in landfills. Such waste disposal creates serious environmental problems that affect health of humans and animals and causes serious economic and other welfare losses. The environmental degradation caused by inadequate disposal of waste can be expressed by the contamination of surface and ground water through leachate, soil contamination through direct waste contact or leachate, air pollution by burning of waste, spreading of diseases by different vectors like birds, insects and rodents, or uncontrolled release of methane by anaerobic decomposition of waste. In order to improve the solid waste management of the city of Santiago de Cuba, an investigation of the households' waste generation and treatment was conducted. In summer 2004 a field experiment was carried out. The effects of public commitment and prompts upon recycling behavior and different forms of persuasion upon compost behavior were tested in varying sequences in 6 areas of the city. The effects of these strategies were assessed by a panel survey that took place at the beginning, at midway, and at the end of the experiment. In one control area only the panel survey was applied. Also a monitoring was conducted in the form that a small sample of people had to fill out a short questionnaire every day. Using multivariate analysis of variances the differences of the factor means over the three points of measurement were calculated separately for the intervention areas and the control area. The following factors were analyzed: behavior, intention, attitude, personal return, affect, habits, difficulty, and observed behaviour of others. The results showed significant differential effects of the intervention strategies on behavior and some of the behavioral factors. These results allow to draw conclusions about what factors are affected by which intervention strategy. This knowledge will improve our understanding of how these strategies are working psychologically which in turn helps to design more effective intervention strategies.