# You Aren't Gonna Need It Is a computer science principle that states that you should resist building features ahead of time and adding complexities you think you'll need down the road for several reasons: - You'll waste time you need for more pressing stuff - As time passes you'll gather more info about the feature, making the future you a more capable programmer for building that feature - The feature might prove unnecessary down the road. This basically boils down to analyzing the [[Economic Cost]] of extra functionality you don't need at the moment. It's also closely related to the [[KISS]] principle.