It has been proven by The Front Door Ltd (the premier door to door research company and, member of the Direct Marketing Association) that on average 50% of householders do not remember receiving the material that comes through the letterbox from door to door distribution.
When backchecking is undertaken, to be anywhere near effective it must be carried out scientifically. This means that the canvasser must not only ask the householder if they have received a particular leaflet in question but they must also ask the householder if they remember seeing any other of the leaflets that were delivered with it.
The individual leaflet in question must be shown to the householder and if they don’t remember receiving that leaflet all the other leaflets, in turn, must be shown to the householder. Doorstep or other face to face backchecking using any other techniques will produce inaccurate information.