By Bill Hall: Most executives know the drill. Fourth quarter rolls around, and it’s time for a strategic-planning session once again. This is a time-consuming process in which business leaders create exhaustive (and exhausting) slide decks outlining the strategy for the following year.The results are usually a couple of days of presentations, discussions and analysis at an offsite location (or maybe in a meeting room). Managers often arrive at the meeting energized, enthusiastic and motivated to drive results into the next year. But most of us know that the energy fizzles, and most things drift back towards business as usual. Why does this happen?