While some degree of freedom and flexibility is an essential ingredient to productive cross-functional NPD teams, upper-managers are faced with the challenge of instituting effective control mechanisms which head projects in the right strategic direction, monitor progress toward organizational and project goals, and allow for adjustments in the project if necessary. But too much or the wrong type of control may constrain the team's creativity, impede their progress, and injure their ultimate performance. Therefore, this study examines formal and interactive control mechanisms available to upper-managers in controlling new product development (NPD) projects, and the relationship between these mechanisms and NPD project performance. Formal output and process controls are examined which consist of the setting and monitoring of outcomes, such as goals, schedule and budgets, and of processes and procedures, respectively. This study also looks at how the effectiveness of these control mechanisms may be contingent upon the degree of innovativeness in the project and the degree to which the project is part of a broad product program. In addition, the use of formal rewards for achieving team performance as opposed to rewards for individual achievement is investigated. Lastly, interactive controls are examined which consist of upper-managers interacting directly with project members in the development of strategy and operational goals and procedures prior to the start of the project, and upper-managers intervening in project decision-making. Questionnaire data are collected on 95 projects across a variety of industries. The findings suggest that while NPD projects teams need some level of strategic direction concerning the objectives to be accomplished and the procedures to be followed, upper-level managers can exert too much control. In particular, the findings showed a negative association between the use of upper manager-imposed process controls and project performance. The findings also indicated that the degree to which upper-managers intervened in project-level decisions during the project was negatively related to project performance. However, the results showed support for the notion that early and interactive decision-making on control mechanisms is important for effective projects. In particular, early team member and upper-management involvement in the setting of operational controls, such as goals and procedures for monitoring and evaluating the project, was positively associated with project performance. This study provides additional insight into our understanding of upper-management support in new product development. The study suggests that upper-managers can over control with the wrong type of controls, and suggests effective ways of implementing participative and interactive control mechanisms.