Drs. Arent, Berger et al. wanted to examine if walking during lunch impacted workplace productivity, employee mood, and employee energy levels, relative to a no-walking control condition. It has been shown that walking has a positive impact on mood but there is little evidence that productivity and energy levels are also impacted. As such, Drs. Arent, Berger et al. are seeking to replicate earlier work on factors that affect workplace mood, while extending their findings to two other important areas (i.e. productivity and energy). In this study, employees at a computer factory were randomly assigned to either walk during half of their lunch break (walking condition) or to not go on a walk (no walking control group). After lunch, all employees were asked to report their level of mood and their energy level, and the number of computers they assembled was also measured to assess productivity. Mood was rated on a 5-point scale where higher numbers indicate a more positive mood. Energy was rated on a 7-point scale where higher numbers indicate feeling more energized. Drs. Arent, Berger, et al. predicted that walking during lunch would increase workplace mood, energy levels and overall productivity. Questions; 1.What is the independent variable