This Pocket Guide provides a concise introduction to the IT4IT™ Reference Architecture, Version 2.1, an Open Group Standard. The IT4IT standard provides a vendor-neutral, technology-agnostic, and industry-agnostic reference architecture for managing the business of IT, enabling insight for continuous improvement. This Pocket Guide is based on the IT4IT Reference Architecture Version 2.1. What's more, it's authoritative with material derived from the official IT4IT documentation and contributions from members of the IT4IT Forum. The audience for this Pocket Guide is: * Individuals who require a basic understanding of the IT Value Chain and IT4IT Reference Architecture * IT Professionals who are responsible for delivering services in a way that is flexible, traceable, and cost-effective * IT Professionals / Practitioners who are focused on instrumenting the IT management landscape * IT leaders who are concerned about their operating model * Enterprise Architects who are responsible for IT business transformation Topics covered include: * An introduction to the IT4IT Reference Architecture, the structure of the IT4IT standard, and the positioning of the IT4IT standard in the standards landscape * The IT Value Chain and IT4IT Reference Architecture concepts, including Value Streams * The Strategy to Portfolio (S2P) Value Stream * The Requirement to Deploy (R2D) Value Stream * The Request to Fulfill (R2F) Value Stream * The Detect to Correct (D2C) Value Stream * A summary of the differences between the IT4IT Reference Architecture and ITIL