In an era of “launch and learn” is there a need for a business plan? Short answer: absofuckinglutely. I have seen really great product people espouse the death of the business plan. Do so at your peril. So, definition: when I talk about a business plan I’m not talking about a 40-page Word document outlining your market approach. That died with waterfall software development. I’m not even talking about your 12-page Powerpoint presentation that you need to raise venture capital or to talk with potential biz dev partners. I’m talking about your financial spreadsheet.