Gp232, I agree with your call out since sometimes people do use those roles interchangeably and they are actually different. Product Manager is keeping track of the product as it evolved from the development phase to launch. I do believe that the most critical is understanding factors that affect the product sales. This portion definitely provides the initial steps if identifying why the sales are not as forecasted and locate the possible issues. From this point, it may direct to the other roles of checking the market or evaluating the competitors’ products to see what the company can improve.