Large-Scale Scrum (LeSS) is a framework for scaling Scrum to medium to large projects while staying true to the original Scrum principles. It provides a couple of simple rules that define the LeSS framework and how teams and organizations work with it. Within the framework provided by LeSS, organizations need to evolve their own practices and continuously improve those. LeSS has been used in companies such as JP Morgan, Bank of America-Merill Lynch, Ericsson, and NSN. This talk introduces the LeSS framework and rules and provides some guides on adoption. The talk is roughly based on the upcoming Large-Scale Scrum book and the LeSS Practitioner courses.