She shared two easy guidelines about how to scale ideas over time. Both are as applicable to boardrooms as they are to classrooms. • People can only remember about seven or so complex concepts at a time, over a period of about 10 minutes. (It’s a scientifically observed phenomenon, which George Miller called the “magical number seven plus or minus two.”1) • Stop and review your previous seven (plus or minus two) concepts before moving to the next group every 10 minutes or so.
