Detailed plans may make managers feel good but too often they matter little to performance.
Keep it simple - summarize in a One Page Plan
Don't look for perfection - Strategy is not about finding answers. It is about placing bets and shortening the odds.
Make the logic explicit - Be clear about what must change for you to achieve your strategic goal.
The Mindshop process of facilitated Strategic Plans needs only ten or twelve pages headed by a One Page Plan.
The key is in implementation.
Many benefit by having external discipline from a facilitator and mentor.