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Radiance calculation method

I was having a discussion with a colleague about how daylighting simulations work. When I run several daylighting simulations with Radiance (In DesignBuilder) i get different result each time. I read somewhere (forgot where) that this is because of a randomization in the calculation process of daylighting simulations. Could anyone explain to me how this works? Is this randomization also a reflection of reality or more a result of being unable to accurately represent reality (so far)? I would like to explain this to my colleagues in fairly simple terminology so I do not have constant discussions with them as to why the results are different. Simply saying: "thats just how daylighting simulations work" isn't enough of an answer for either of us, so please let me know what you know!