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One of the most useful features of goal models of the i* family is their ability to represent and reason about satisfaction influence of one goal to another. This is done through contribution links, which represent how satisfaction or denial of the origin of the link constitutes evidence of satisfaction/denial of its destination. Typically in the i* family, the nature and level of contribution is represented through qualitative labels ("+", "−", "++" etc.), with the possibility of alternativelydblp:conf/istar/LiaskosHJ13 fatcat:lj4l47s3wjcglebv4b3xxzqafi