> We had "complete" software for decades. You can use an iterative development model until all of the major goals are achieved then ship a final product. After

> We had "complete" software for decades. You can use an iterative development model until all of the major goals are achieved then ship a final product. After that it's just maintenance. well or its not, depends on the industry but most likely there will be new features etc. You need to be able to ship security features and bug fixes continously - e.g. without manual user action because most users simply don't have mental capacity to upgrade software. Alas continous delivery.