Cortex worked with the Tahltan First Nation and the B.C. Integrated Land Management Bureau to assess the potential cumulative effects of different industrial activities in the Klappan region of north-western B.C. The goal of this project was to determine the effects of development activities on the ecological and socio-cultural values for areas traditionally used by the Tahltan and assist them in developing sound sustainable land-use policies. Cortex provided both cumulative effects analysis, and facilitated collaborative community indicator development services as part of this project. Cortex also facilitated roundtable meetings with community leaders, elders, resource professionals, and stakeholders to aid development of an analytical approach for assessing the effects of industrial activity on ecological and socio-cultural values. We employed focused discussions on values important to participants and a technique known as “mind-mapping” to record and organize how the landbase was used by each member of the roundtable. These annotated mind maps served as immediate feedback to the participants on how the effects from economic activity could be related to social, cultural, and ecological values, and the key indicators needed to understand the impacts of different management decisions. The outputs of these facilitated sessions were used by analysts and domain experts to design and build the models and scenarios needed to assess potential impacts of industrial activities on identified values.