Report of the first year of a three-year study attempting to understand the processes of Teen Evaluation and Maturation (TEAM) in operational Navy contexts, seeking to document changes occurring when team members learn about their tasks, each other, and the environmental demands of the scenarios of the Naval Gunfire Support (NGFS) Department, Naval Amphibious School, Little Creek. Research seeks to (1) systematically identify team skills, tasks, behaviors and conditions that influence training instruction and design; and (2) development of measures of these variables to provide a base of knowledge for designing and using interventions to enhance team training programs. This model suggests a seven stage life-cycle of a team progressing at different sequences and rates depending on the efficacy of their training. Resulting data from the four teams to which skill measurement was submitted tend to support the proposed model as well as indicating the sensitivity in the device to differences between good and poor teams and to change behavior during training. Refinements of methodologies and development of interventions to improve training are anticipated. (Author/RR)