Abstract: A computer-implemented method for tracking membership of a collection based on new records corresponding to new membership change events. The method comprises receiving a batch of new records for membership change events from a segmentation engine; preprocessing the new records and historic records to exclude invalid membership change events; creating a normalized data table of the valid membership change events; and sending the normalized data table to an analytics processing database for computing at least one metric for the collection based on the normalized data table. Optionally, the collection is an audience and the metric is segment growth. Related computer systems are described.