Very, very true. Just as no battle plan survives contact with the enemy, no product idea survives contact with the customers. From the ground up you need to pla

Very, very true. Just as no battle plan survives contact with the enemy, no product idea survives contact with the customers. From the ground up you need to plan for change, keeping your development cycle flexible so that you can adapt and adjust to feedback from the customer. It is like the difference between writing code with configuration variables embedded in hundreds of places in the code or building it with a user interface to allow the customer to adjust the settings.