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...Agile methods and requirements many argue that producing detailed system is a waste of time as change so quickly the document therefore always out date usually use incremental engineering may express user stories this practical for business systems but problematic require pre delivery analysis e g critical or developed by several teams functional non statements services should provide how react to particular inputs behave in situations state what not do constraints on functions offered such timing development process standards etc often apply whole rather than individual features domain from operation vs an example requirement would be must send email whenever certain condition met order placed customer signs up related emails sent with latency no greater hours activity describing behavior it relates s functionality elaborates performance characteristic stakeholders any person organization who affected some way has legitimate interest stakeholder types end users managers owners externa...