As the first of four pillars in Making Time, they prescribe the Highlight step as 'Start[ing] each day by choosing a priority.' Asking yourself 'What's going to be the highlight of my day?' ensures that you spend time on what matters most to you and don't lose the entire day reacting to other people's priorities.
They pushed the highlight concept further than the standard 'prioritize the most important work task' idea to figuring out the most important task for your day that aligns with your life's priorities, especially one that could easily be lost.
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