Training firefighters is a difficult process in which emotions and nonverbal behaviors play an important role. The authors have developed a mixed reality environment for training a small group of firefighters, which takes into account these aspects. The assessment of the environment was made up of three phases: assessing the virtual agents to gauge their expressiveness, assessing the contextual virtual environment to see if it provides the same decision-making support as that found in the real world, and verifying indexicality to support agent interaction. (Contains 9 figures, 3 tables, and 4 notes.)