There’s a mistake lurking in your 2015 marketing plan. It’s a doozy, a real whopper. It’s probably lurking in your plan right now if you’ve made one, and if you haven’t, it’ll be in there when you do. The mistake is this: 2014. And 2013. And 2012. And so on. The past is what’s in your future marketing plan, and the past is going to hurt you. Every day, I talk to people, to colleagues, to friends, to clients, and to prospects. Every day, I hear people mention outdated knowledge, knowledge that is now ineffective or outright harmful to your marketing.