To live up to our promise, we guarantee a 100% viewability on the Adfactor special display formats: Adfactor Angel, Adfactor Transformer, Adfactor Interscroller, Adfactor Autonative, and Adfactor Slider. Because paying for something you only partially receive is not something we subscribe to. We only include the ad impressions provided according to the IAB Standards on viewability. Ad impressions which have not been displayed will not be included and will be booked again. Measurements are done based on Google’s Active View, a function in Google’s DFP ad server (DoubleClick for Publishers).