A field experiment conducted with 53 hard-rock miners in an underground metal mine examined the effects of two interventions, team building and goal setting, on miners' productivity and strategy development. The study employed a 2 × 2 factorial design with random assignment of participants to the goal setting condition, and it used objective criteria of performance. Unfortunately, the results were inconclusive. Although slight improvements occurred in some measures of performance and strategy development, it is not clear that these improvements were results of the interventions. More of these improvements occurred in the goal setting than in the team building condition. Limitations in the research design and factors in the experimental setting that could not be controlled led to equivocality of these results.