Book excerpt: This book has been written to assist those people who are starting, and also those that are already involved, with the process of managing the cost of Information Technology, and looking for the appropriate way to manage that cost to deliver business value. A structured method to deliver this, Technology Business Management (TBM), will be introduced in terms of the ideas, approaches, challenges and responses that are involved. TBM has developed and formalised as a consolidated set of disciplines since the late 'noughties,' previously having been activities carried out piecemeal and usually prioritised on an ad-hoc basis or to firefight specific organisational issues as they arose. In larger organisations, the activities which are now grouped together under a TBM banner were separate functions, with little or no recognition of the value to be gained by improving their cross-functional interaction. Without any formal structure to guide this, alongside the necessary level of professional expertise, and the training and focus needed to maintain core capabilities, the isolation of finance and technology functions was only broken down in a few companies. This book takes the practical disciplines of TBM and builds on the central concepts related to value which were covered in the 2016 book by Todd Tucker, "Technology Business Management: The Four Value Conversations CIOs Must Have With Their Businesses ". The development of TBM is as much founded on in its practical delivery as in the recognition of its value, and this book brings together structured guidance on that, based on real-life implementations and conversations about the concepts. The increasing capabilities of tools which help integrate information from multiple business functions paved the way for many innovative business improvements, and continue to do so. The recognition of the value to be gained in bringing this ability to the combination of management disciplines from technology, finance and business is where Technology Business Management derived its core propositions. Gradual development of the formality around this, with incremental value being able to be delivered over a sustained period, is why TBM has grown to its current state. A particular backbone of this is the TBM Taxonomy, which is included in this book as an Appendix. The other major factor in the development of Technology Business Management as a discipline has been the recognition of the value of a community of common interest, rather than the previous islands of competence. TBM is what has developed in the last decade from the starting point of those far-sighted individuals, companies and suppliers who saw a common interest in fixing problems that many organisations looked at as "too hard". Continuing to build those communities of interest around TBM is a route to innovating and continuing to gain value, both within an organisation and within and across industries. There is still a gap between what it is possible to communicate and teach, as against what can be built through more direct relationships between those who are thoughtful, skilled, inquisitive or knowledgeable in a topic. A common understanding of the challenges and failures that are likely to affect those working in this space is, however, useful. That is what this book targets.