I have talked previously about how as a manager, it is imperative that you optimize your resources in order to maximize your ROI (return on investment).  That is key for any manager to be successful.  The complex part of ROI is that it is always malleable.  It never stops even after the project is complete.  In fact, many times, the ROI is entrusted to be higher once the project is complete and then you can maximize your investment.  The turn around time for the start of maximization is also very important which goes into your time management skills.  How well can you adapt, change, and update your project so that it meets its time constraints.  Any elongation of the project can lead to a huge downturn in ROI which is never a good thing.