Requirements Engineering

Requirements Engineering

requirements

defined during early stages of system development as a specification of what should be implemented or as a constraint of some kind on the system

requirements engineering

covers all activities in discovering, documenting and maintaining a set of requirements for a computer-based system

what if requirements are wrong 1

system may be delivered late and cost more than expected

what if requirements are wrong 2

customers and end-users not satisfied. may not use it or decide to scrap it altogether

what if requirements wrong 3

system may be unreliable in use with regular system errors and crashes disrupting normal operation

what if requirements wrong 4

if system continues in use, costs of maintaining and evolving system are very high

why RE difficult 1

changing environments

why RE difficult 2

differing views

why RE difficult 3

unclear opinions

why RE difficult 4

politics and people

stakeholders

people or roles who are affected in some way by a system and so who can contribute requirements or knowledge to help

viewpoints

a way of organizing and grouping requirements that have been elicited from stakeholders

concerns

systemic issues that an organization must pay attention to