A method for constructing user models from user usage and context data is provided where a personal interest graph for a user is constructing from interests of the user derived from usage data and situational data derived from one or more sensors of the electronic device. The nodes in the interest graph also contain information about a degree of user interest in the corresponding interest and a sentiment of the user at the time when the usage data suggests that the user expressed interest in the interest graph. The personal interest graph can be modified by annotating one or more nodes of the personal interest graph with influence information. Later, a current sentiment for the user can be determined by analyzing input from one more sensors on the electronic device, and a particular node can be located in the personal interest graph based on the information in the nodes.
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