Agile Argument Against Formal Requirements Documents

Requirements change so rapidly that a requirements document is out of date as soon as it is written, so the effort is largely wasted

Explanation

Agile development methods argue that requirements change so rapidly that a requirements document becomes out of date as soon as it is written, making the effort largely wasted. Instead, approaches such as Extreme Programming collect user requirements incrementally as user stories on cards, prioritizing them for implementation in the next increment.