A wise marketing professor once said that when things go wrong, more often than not, it isn’t because the strategy was bad; it was because the strategy was executed poorly, or, not at all. In other words, nobody made it happen.
William Bonoma at the Harvard School of Business likened it to war. He said, in effect, without a competent, hard-charging sergeant to drive the squad up the hill, no strategy would work.
An expression I don't hear much any more is, “don't sweat the small stuff,” but I absolutely see demonstrations of it everyday. It means don't worry about the details and concentrate on the “big picture.”
Yet, little matters more than the details, because it is the details that determine the quality of the execution, and most great strategies or plans fail, not because they were bad, but because they were executed poorly. Billions in a retail chain with check-out clerks who don't even look at the customer.