You're not building "software," you're building something for someone to use. Done is defined by what that person needs to do their work. Done should be defined up front, or at least as far ahead as possible so it's clear.
One of the first questions I ask when probing about the state of a project or task is "how do you know when you're done?" Too often, the answer is a shrug, or a deer in headlights look!
One of the first questions I ask when probing about the state of a project or task is "how do you know when you're done?" Too often, the answer is a shrug, or a deer in headlights look!