> The problem I've seen when yagni is applied is not building something now leads to a costly data migration down the road when you actually do need it. I see

> The problem I've seen when yagni is applied is not building something now leads to a costly data migration down the road when you actually do need it. I see YAGNI fail when it's used an excuse to not think about the future at all, rather than a reason to delay building parts of a system that aren't needed yet. Relative to building software, thinking about it is cheap. I usually think about: * how needs might change in the future * what would have to change in the current system in order to satisfy those future needs * how difficult changing the system to meet those future needs would be. Ultimately, I know whether the current software design can easily adapt in the future.