1. A data visualization system comprising: an interaction database maintained in a computer memory of interaction data representing interactions between customers and at least one merchant, the merchant operating a contact center having a plurality of operators, the interaction data representing respective interactions between customers and operators; a retrieval component configured to retrieve from the interaction database data representing interactions between customers and the merchant, and to construct a finite set of data values from the retrieved data; a display component configured to display a graphical representation of at least one merchant and a graphical representation of each of the set of data values centered on respective data points; a contour generator configured to generate and display one or more contour lines at least partly around each data point or group of data points, in which each data point is displayed as a local maximum, and each contour line representing data values that are less than the data value or data values of the data point or group of data points around which the contour line is displayed; and each of the operators has an operator identifier comprising a network address; at least some of the interaction data including respective operator identifiers and at least one time value representing a duration of the interaction between the operator and the customer; and the merchant operates from 1) one or more call centers that are accessed by customers over a telecommunications network, 2) one or more websites that are accessed by customers over a computer network, or 3) one or more telemarketing centers that initiates interactions with customers over a telecommunications network.