This volume constitutes the proceedings of the Tsukuba Workshop for the IPCC Working Group III held on 17-20 of January, 1994 at Tsukuba, Japan. It reflects the dual objectives of the Workshop. The first objective is to provide input to the current IPCC work of preparing for the Secondary Assessment Report, especially materials focusing on the assessment of such policy instruments for preventing global climate change as taxes, subsidies, regulatory measures and joint implementation. The larger part of this volume is devoted to the papers presented by distinguished researchers in these fields, including papers contributed by the lead authors of Writing Team 8 who are responsible for this area.