Because the characteristics of the knowledge representation influence both the instructional design and knowledge elicitation processes, its selection is the core of the training system design process. To assist the selection, this investigation considers the interaction of three system development components, knowledge elicitation, knowledge representation, and learning environments, within the context of the domain characteristics and the overarching theoretical framework. Following our description of these interactions, we apply the model to tactical land navigation, a domain representative of one class of skilled military performance. This application then leads to a description of our selection criteria and a brief evaluation of two candidate knowledge representations.