In 1927, a Russian psychologist Blyuma Zeigarnik found that people easily remembered incomplete tasks (tasks during which they were interrupted) or issues than completed ones in various workplace situations. This phenomenon was known as the Zeigarnik Effect. E.g. Waiters only remembered orders which were in process of being served or were unpaid.

Applied in a human resources context, it refers to an employee’s inability to focus on multiple assignments or tasks at the same time because of an incomplete task. Missing lunch breaks as a result is quite common as well. Other scholars have also researched and found that completing tasks can have a positive psychological impact while failure to complete tasks has
corresponding negative psychological consequences. E.g. When consumers assembled IKEA boxes, they valued the self-made products higher and of equivalent value as any product made by experts.