Environmental conflict situations are typically messy; a tangle of complexity, controversy, and uncertainty. As a means for addressing environmental conflict and decision situations and making progress on matters of substance, relationship, and procedure, Collaborative Learning integrates concepts and techniques from systems thinking, negotiation, experiential learning, and participatory communication. This essay establishes a context for understanding the creation and evolution of the CL methodology. Following that discussion, the Collaborative Learning approach is explained. A current comprehensive project in forest planning provides a case illustration.