1. A computer implemented data processing system for processing data related to incoming interactions, the data processing system comprising: a first configuration object defining a set of metrics, a second configuration object defining a number of aggregation primitives, by analyzing requirements of the set of metrics, a first processing unit adapted for receiving data related to incoming interactions, and adapted for real time calculation of at least one aggregation primitive based on this data taking into account the second configuration object, a data storage element for storing the calculated at least one aggregation primitive without storing raw data related to the incoming interactions, a second processing unit adapted for calculating one or more metrics based on the stored at least one aggregation primitive taking into account the first configuration object and the second configuration object, the data processing system moreover comprising a metric change queue and a write interceptor adapted to intercept storing of the at least one aggregation primitive and to evaluate which metrics may be affected by this aggregation primitive and to add these potentially affected metrics to the metric change queue.