This guide has been written for all passionate project practitioners. People who are driven by the need to create real impact and are willing to take untraditional measures to lead projects. Whether you are a PMO, project owner, project manager, team member or someone who invests time in temporary endeavours undertaken to create an impact - this guide is for you. This guide is the shorter version of the Half Double Methodology Handbook, which focuses on explaining the use of the Half Double Methodology. It is a practical guide designed to change your way of thinking and acting in and with projects. It provides you with hands-on principles, methods and tools to help you realize projects with double the impact in half the time. A guide designed to enable you to go out and do it yourself. The guide is also mandatory reading for taking the Half Double Foundation Certification Exam. Consultancy, universities, companies and more than 2,500 practitioners have co-created the ideas presented here in this guide. Half Double is a methodology created through practice, with real practitioners. It has already created proven impact in projects around the globe, delivering on the overall ambition of realizing projects in half the time with double the impact. In essence, the guide extends the known agile methods with concrete methods for impact realization, reflective leadership and a strong focus on how people are motivated and perform - it's all about placing an extreme focus on three core elements: * Impact - Stakeholder satisfaction is the ultimate success criterion. * Flow - Intensity and frequent interaction in project work with weekly progression. * Leadership - Embrace uncertainty and make the project happen.