In the continuing search for clarification of the patentability and inventive step criteria for computer implemented inventions, a Technical Board of Appeal of the EPO has used surprisingly clear wording to stop computer implemented inventions from expanding into the realm of functional, business method type claims. It has become more or less standard for applicants to argue that because of an "interaction" between basic technical features (such as processors, memories and displays) with "non-technical" features (e.g. certain specific data), the claim as a whole could constitute a patentable invention. It is exactly the nature of this "interaction" that is discussed in the recent decision T-1670/07. The EPO now warns that a lot of these arguments are considered "fallacies".