You have been chosen as the project manager for a project to develop an e-commerce presence for your company, which has, until now, been primarily a brick-and-mortar business. Upper management has arbitrarily chosen a launch date six months from now. You and your team have determined, through following the techniques described in this chapter, that completing the project in six months is possible, but unlikely. The project sponsor has asked you to tell him what day you expect the project to be complete. Explain why predicting the finish date down to the specific day is problematic. How might you explain this to reassure him that he has chosen the right project manager for the job?