Low costs, economic efficiency, speed of implementation and flexibility, are the characteristics of the hottest game offered presently in the environment business - voluntary mechanisms contracted between statutory authorities and polluters. Attorney Tzvi Levinson, the chairman of the Israel Bar environmental committee analyzed the pros and cons of contractual mechanisms in furthering environmental goals, and answered questions such as: What makes a successful contractual mechanism? Who should join a contractual mechanism? Under what conditions? What opportunities, business and other, does a contractual mechanism offer over other mechanisms to implement environmental standards?