Introduction On 11 January 2021 – in an apparent conclusion to the patent at the heart of the Federal Court's decision in Yves Choueifaty v Attorney General of Canada (2020 FC 837) – the commissioner of patents allowed Canadian Patent Application 2635393 (CA '393) in Commissioner's Decision 1556 (CD1556) (2021 CACP 3). CD1556 provides insight into how the Canadian Intellectual Property Office (CIPO) will: approach patentable subject matter in future; and apply the new guidelines on patentable subject matter released in response to Choueifaty (see below). The Federal Court rejected CIPO's problem-solution approach for determining patentable subject matter in Choueifaty (for further details please see "Federal Court rejects problem-solution approach, opening field for computer-implemented inventions"). The Federal Court found that this previous approach disregarded the intention of the inventor contrary to the purposive claims construction required by the Supreme Court of Canada in