The 2 slits experiment can be carried out by firing a single electron at a time and then over time observing the gradual build up of what appear to be interference patterns characteristic of a wave passing through the 2 slits on the screen behind the slits. This is despite the fact that the point of detection of each electron as it arrives appears to be random. It appears then that the path of each single electron passing through one or both of the slits has an effect on the path taken by subsequent electrons. If the assumptions above are correct there is no obvious classical explanation for what is observed. Q. What characteristics are measured to confirm the presence of a SINGLE electron being fired? Q. What characteristics are measured to confirm the presence of a SINGLE electron arriving on the screen behind the slits? I presume the determination of the presence of a SINGLE electron is achieved by measuring the quantity of specific properties such as charge and spin. How though were the determinative quantities being utilised originally bench marked? If for example an electron were only able to exist as a pair of particles then the smallest reading of such properties would equate to a pair of particles. The method of propelling each electron towards the slits would be expected to be inherently random in determining the initial trajectory of the particle. Thus the presence of interference patterns indicates some effect that alters the initially random trajectory of a majority of the electrons such that the majority of the electrons are directed to specific regions of the screen. Such an effect could be envisaged as the presence of a continuous ever present field that is propagating as waves through the slits and generating interference patterns beyond the slits. As each electron enters the field its random trajectory will more often than not be affected by a region of peaks and troughs which will then channel the electron toward one of the specific "interference" regions of the screen.