In 2016 Vote Leave built a bespoke database called VICS (Voting Intention Collection System) which was an online database that local activists used for canvassing and Get Out the Vote operations. The VICS system was the first of its kind to incorporate a geographic street-based reactive demographic model which directed activists towards streets likely to support leaving the European Union. As canvass returns were entered into VICS the model reacted to adjust which streets were priorities so it became more accurate based on actual canvass returns rather than relying solely on demographic modelling. The VICS system was widely credited with the success of Vote Leave's campaign.