So many different experiments, so many variations, so many versions of interpretations and story-telling abstractions. Rather than trying to understand what measurements mean, I would like to know how are they performed. Rather than theoretical, I'm interested in practical aspects of an actual experimental setup. I don't know what experiment to talk about. I hope someone can point to some of the simpler ones for which there is an actual measurement data and the details of the equipment. I'll start with this one, described in post #18: https://www.physicsforums.com/showthread.php?t=454275 Initial setup: angle choice constants: -30, 0, +30 diagram of the whole setup? number of measurements to perform? expected result and margin of error? properties of polarizers P1 and P2? properties of of RNG1 and RNG2? anything else relevant at this point? Event T0: photons L1 and L2 emitted properties unknown? properties uncertain? properties certain? anything else relevant at this point? Event T1: random number generator, one or two independent? P1= RNG1(-30,0,+30) P2= RNG2(-30,0,+30) anything else relevant at this point? Event T2: L1 <interaction> P1 L2 <interaction> P2 interaction unknown? interaction uncertain? interaction certain? anything else relevant at this point? Event T3: measurement: what where, how, why? anything else relevant at this point? So the goal is to fill up this table of events with all the relevant information that can be said about the setup at each event point in time, or insert some new event I overlooked perhaps. At the end I expect to have clear insight of all the variables and constants describing the setup and influencing the measurements, so that I would be able to define them in a computer program in an algorithm that would try to mimic the experiment as a simulation.