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===Goal modelling principles===
{{further|[[Goal modeling]]}}
Within [[Requirements analysis|requirements engineering]] (RE), the notion of goal has increasingly been used. Goals generally describe objectives which a system should achieve through cooperation of actors in the intended software and in the environment.<ref>L. Liu and E. Yu, “Designing information systems in social context: a goal and scenario modelling approach”, 2003 Elsevier Ltd. http://www.cs.toronto.edu/~liu/publications/ISj03.pdf</ref> Goals are central in some RE frameworks, and can play a supporting role in others. Goal-oriented techniques may particularly be useful in early-phase RE. Early-phase requirements consider e.g. how the intended system meets organizational goals, why the system is needed and how the stakeholders’ interests may be addressed.<ref>
E. Yu, “Towards Modelling and Reasoning Support for Early-Phase Requirements Engineering”, 1997 IEEE</ref>
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