What type of work contributes directly to the completion of an activity?

The term that best defines work contributing directly to the completion of an activity is productive work. Productive work refers to efforts that lead to tangible results, advancing a project or task towards its completion. This type of work is crucial in any workflow, as it enhances efficiency and culminates in achieving specific goals.

In contrast, contributory work is more ambiguous and does not specifically emphasize direct impact on task completion. Nonproductive work typically refers to efforts that do not result in significant output or progress. Obstructive work actively hinders progress, creating barriers that delay or complicate the completion of activities. Understanding these distinctions helps in managing projects effectively by identifying and focusing on productive efforts that drive success.