Which principle recommends maintaining a focus on efficiency while avoiding waste?

The principle that emphasizes maintaining a focus on efficiency while avoiding waste is closely aligned with improving management capabilities. Effective management involves streamlining processes, optimizing resource allocation, and implementing best practices to enhance productivity. By focusing on the efficiency of operations, a manager can identify areas where waste can be reduced, therefore increasing overall effectiveness and contributing to the organization's success. This principle encourages leaders to refine their skills and approaches, ultimately fostering a culture of continuous improvement aimed at minimizing waste in all aspects of the business.

The other options do not directly address the idea of efficiency and waste reduction to the same extent. Promoting fairness and impartiality is essential for a healthy workplace, but it doesn't specifically target efficiency. Similarly, while clear goals for employees are vital for performance, they do not inherently promote an efficient approach to operations. Thinking positively is important for morale, yet it does not directly facilitate the elimination of waste or the pursuit of efficiency.