AI is inevitable. Every organisation has to adopt it. The challenge is to do this adoption in spite of the risks and the pitfalls. The transformation methodology -- DIGI4MATION -- presented by the author in his earlier book has been adopted herein as a customised methodology for the implementation of AI in an organisation. This customed 16-step methodology has been named as AI4mation -- transformation to AI in the fourth industrial revolution. This book has been written as a detailed guide using which an organisation can successfully transform itself to AI using its internal resources without the help of expensive consultants. A comprehensive set of Appendices has been included to give templates of the most critical deliverables. This Guide is based on Lean Six Sigma, TOGAF, ISO 42001, ISO 37000 series, ISO 38500 series, and the ISO 27001 series in addition to other standards. Whether you are starting your AI journey or are deep in the throes of scaling it across your enterprise, this book will give you a framework to think strategically, act systematically, and improve continuously. The author has added three case studies - two of them based on actual experience, but with masked identity. The third case study - that of a hospital, is AI-generated. The author hopes that this Guide proves to be a valuable asset to organisations transforming themselves to adopt AI and saves them heavy costs of consultants. The author remains available for any further guidance or help at azharzr@usa.net or through LinkedIn. The companion Website for this book is ai4mation.org