Abstract: The authors describe the use of dialectical letters that were sent to clients after termination of unsuccessful treatments. These letters represent the integration of dialectical cotherapy and narrative therapy. They are based on a new model addressing the use of the dialectical polarity between the problem and the healing force (resources) and the way it affects therapeutic change. Excerpts from this model as it is relevant to dialectical cotherapy are presented. (PsycINFO Database Record (c) 2007 APA, all rights reserved)