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  1. 1. Towards Modelling and Reasoning Support for Early-Phase Requirements Engineering Eric S. K. Yu Faculty of Information Studies, University of Toronto Toronto, Ontario, Canada M5S 3G6 # ! ¢¨¦¤¢  ¥§ ¡ ©§ ¥ £ ¡ Abstract would be adequately specified and constrained, often in a contractual setting. Requirements are usually understood as stating what a system is supposed to do, as opposed to how it should Considerably less attention has been given to support- do it. However, understanding the organizational con-