Let me first start of with the caveat that I have no formal training in the scientific method, but do have some basic understandings. So, I might not use the appropriate terminology and might even be over my head.
It seems you are coming to the forum with some specific assumptions, perhaps based around the terms "science" and "experiment". Furthermore, it seems you assume we know what assumptions you have made. This makes discourse prone to misunderstandings and put those who are trying to answer you in a position of guessing not only the substance of you inquiries but also the intent behind them.
If you are thinking this "experiment" is pure science, following the protocols of scientific method, I'm afraid you will be disappointed, OSIT.
It might be beneficial to note that, since this is a forum with participants with various levels of experience on this forum and knowledge of the fields of study involved in subjects handled on this forum, filtered through their subjective interpretations, you might find a variety of answers to your questions. Those closest to the processes, especially those who conceived and executed them would probably be able to give you the most accurate information regarding specifics of original intention, hypotheses and mitigations.
However, much of this information is documented in publications like "The Cassiopaean Experiment" (http://www.cassiopaea.org/cass/index.html) and "The Wave" series (http://www.cassiopaea.org/cass/waveindex.htm). If you read them, you will end up with the same basic knowledge that most participants of this forum have regarding the history behind and context surrounding the use of the board as a communications instrument (including why it was chosen as the method most likely to provide as objective a result as possible with the least amount of potential for personal and external manipulation), the responses received on it and the research that resulted from lines of inquiry resulting from certain responses.
If you are seriously interested in understanding what has been and continues to be experienced and why, then I would suggest you change your approach, since your current one will only result in frustration and will not give you what you seek.
If, however, you just came here to say "aha, I caught you claiming to be running a scientific experiment and have found several flaws in your logic" followed with accusations of being charlatans, then, not only would that be rude and ignorant, but it would make you out to seem rather foolish, since nowhere is it claimed that these experiences I channeling are following the scientific method. However, I do believe the selection of the board instruments, the process of working through personal ego influence and the purposeful use of specific protocols in the forumulation of questions occur withing an awareness of the scientific method insofar as to address as much of the intention or spirit behind pure science protocols as is possible and practical.
In fact, I think I'm safe to say that the approach taken is the most scientific I've ever encountered.
Finally, it's important to recognize that the responses afforded through the channeling sessions are not consumed as truths. Rather, they become seeds for hypotheses, for which great effort is applied to further evolve these resulting hypotheses to their natural end, where they are continuously refined. These working hypotheses are contributed through networked research, so that the more heads that research and contribute and the more eyes that critique result in the strongest theories.
Although this forum deals with a considerable amount of esoteric information, it also works deeply in the more concrete areas of biology, psychology, physics (incl. quantum, astro, or at least I think, since it's way beyond my scope of knowlede), cryptozoology, mathematics, to name a few off the top of my head. So, while the initial communications method might seem unconventional or even suspect to some, the resulting and requisite research should be much more familiar and more acceptable to anyone from within institutionalized science (not that they have much right to arrogance, considering the shameful amount of erroneous and fraudulent research that makes its way through peer review processes of late).
So, perhaps if you could back up and, instead of working from assumptions that may be faulty, perhaps you could start with something like, "where could I learn more about this experiment in channeling that I encountered on your front page?" Or "I see that you are running some form of experiment in channeling. Is this an experiment in the scientific sense (scientific method, standardized protocols?".
You might get more precise responses. That is, if that's what you're looking for.
Gonzo