You're happy because your marketing plan is internally consistent, synergetic and realistic. It meets your financial objectives, too.
BUT WAIT -- IS YOUR MARKETING PLAN ROBUST?
Companies often don't test whether they have robust marketing plans, and this is what gets them into trouble. In fact, this often explains why a seemingly good marketing plan goes bust soon after a product gets launched.
So, what do we mean by having a robust marketing plan? It means simply this:
Your marketing plan stands up to alternative market assumptions.
EVERY BUSINESS PLAN HAS ASSUMPTIONS