The US Supreme Court granted certiorari In re Bilski, a case that deals with the patentability of business method claims. In TLQ 4:4, we noted that the US Court of Appeals for the Federal Circuit had ruled in Bilski that all processes, including business methods, need to meet a "machine-or-transformation" test in order to be patentable subject matter. That test asks whether the claimed process is "tied to a particular machine, or transforms or reduces a particular article into a different state or thing." The US Supreme Court decision, it is hoped, will provide some guidance on the viability and boundaries, if any, of business method patents in the US.