The 90/90 Rule Is the Easiest Way to Let Go of Clutter As a professional organizer whose brain isn’t naturally wired for math, I’ve had to overlook the names of some of the trendiest organizing methods. I frequently use the core 4 method, the 1-3-5 rule, and the 90/90 rule. While their titles might seem intimidating, these tried-and-true techniques can be effective for anyone.
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