You glance at the to-do-list on your desk. There are eight simple tasks and one challenging project. You have already put off the project for a couple of days because it’s complex and will take most of your day, if not your entire day, to complete. Nothing on the list is due immediately. What do you do? Some executives knock out all of the smaller projects first and save the intimidating job for the end of the day. The thinking is that you will be more productive and ready to tackle that behemoth job. Unfortunately, that’s the wrong choice. Executives should be focusing on the most important or challenging tasks first thing in the morning, according to experts.