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In a WWDC 2011 session, Dan Schimpf explained some of the goals of the refreshed design for Aqua in Mac OS X Lion were “meant to focus the user attention on the active window content”. This sentiment was echoed by John Siracusa in his review of Lion for Ars Technica:
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最后，每项任务还设有价值评分，综合考量重要性（娱乐型/锦上添型/普通型/重要型/关键型）、截止时间、"最佳完成期"和创建时间等因素。核心目标变为：Mirtillo如何在既定行程间隙安排任务，使未来几天得分期望值最大化？
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